Department of Natural Resources Division 60—Safe Drinking Water Commission Chapter 2—Definitions

Rules of Department of Natural Resources Division 60—Safe Drinking Water Commission Chapter 2—Definitions

Title Page

10 CSR 60-2.010 Installation, Extension, Testing and Operation of Public Water Supplies (Rescinded October 11, 1979) ...... 3 10 CSR 60-2.015 Definitions ...... 3 10 CSR 60-2.020 Grants for Public Water Supply Districts, Sewer Districts, Rural Community Water Supply and Sewer Systems and Certain Municipal Sewer Systems (Moved to 10 CSR 60-13.010)...... 7

ROBIN CARNAHAN (9/30/09) CODE OF STATE REGULATIONS 1 Secretary of State Chapter 2—Definitions 10 CSR 60-2

Title 10—DEPARTMENT OF liquids, gases, or other substances into the available technology must be at least as effec- NATURAL RESOURCES public water system from any source(s). tive as granular activated carbon. Division 60—Safe Drinking 2. Backflow hazard. Any facility which, 8. Beta particle. A particle, identical Water Commission because of the nature and extent of activities with an electron, emitted from the nucleus of Chapter 2—Definitions on the premises or the materials used in con- a radioactive element. nection with the activities or stored on the 9. Breakpoint chlorination. The point at 10 CSR 60-2.010 Installation, Extension, premises, would present an actual or potential which sufficient chlorine has been applied to Testing and Operation of Public Water health hazard to customers of the public water water to satisfy the chlorine demand which Supplies system or would threaten to degrade the water should result in a total chlorine residual of at (Rescinded October 11, 1979) quality of the public water system should least seventy-five percent (75%) free avail- backflow occur. able chlorine. AUTHORITY: section 192.615, RSMo Supp. A. Class I backflow hazard. A back- (C) Terms beginning with the letter C. 1973. Original rule filed Sept. 21, 1973, flow hazard which presents an actual or 1. Cartridge filters. Pressure-driven sep- effective Oct. 1, 1973. Rescinded: Filed May potential health hazard to customers of the aration devices that remove particulate matter 4, 1979, effective Oct. 11, 1979. public water system should backflow occur. larger than one (1) micrometer using an engi- A list of customer facilities, not all inclusive, neered porous filtration media. They are typ- considered to be Class I backflow hazards is 10 CSR 60-2.015 Definitions ically constructed as rigid or semi-rigid, self- included in 10 CSR 60-11.010. supporting filter elements housed in pressure B. Class II backflow hazard. A back- PURPOSE: This rule defines terms used in 10 vessels in which flow is from the outside of flow hazard which would threaten to degrade CSR 60. the cartridge to the inside. the water quality of the public water system 2. Certificate. The certificate of compe- (1) The terms used in 10 CSR 60 shall have should backflow occur. A list of customer tency issued by the department stating that a the meanings set forth in the Missouri Safe facilities, not all inclusive, considered to be person has met the requirements for the spec- Drinking Water Act, the federal Safe Class II backflow hazards is included in 10 ified operator classification of the certifica- Drinking Water Act and regulations, or this CSR 60-11.010. tion program under the provisions of 10 CSR rule, unless the context of the term clearly 3. Backflow prevention assembly. An 60-14.020. assembly designed to prevent the reverse flow requires otherwise. In the event of any con- 3. Certificate of examination. A certifi- of water or other substances from a customer flict or inconsistency, the more stringent def- cate issued to a person who passes a written facility back into the public water distribution inition shall apply. examination but does not meet the experience system. See also definitions of air-gap sepa- requirements for the classification of exami- ration, double check valve, and reduced pres- (2) Definitions. nation taken. sure principle backflow prevention assembly. (A) Terms beginning with the letter A. 4. Chief operator. The person designat- 4. Backflow prevention assembly tester. 1. Action level. The concentration of ed by the owner of a public water system to A person who utilizes recognized backflow lead or copper in water which determines, in have direct, on-site responsibility for the prevention assembly testing procedures to some cases, the treatment requirements, sys- operation of a water treatment plant or water tem modifications, public education, or other determine whether or not an assembly is distribution system, or both. requirements as specified by the department functioning properly. Requirements for back- 5. Chloramines. All amino or imino that a water system is required to complete. flow prevention assembly tester certification groups in which the hydrogen has been 2. Air-gap separation. A backflow pre- are in 10 CSR 60-11. replaced totally or in part by chlorine. vention assembly consisting of a physical sep- 5. Bag filters. Pressure-driven separa- 6. Class I backflow hazard. See back- aration between the free-flowing discharge tion devices that remove particulate matter flow hazard. end of a public water system pipeline and an larger than one (1) micrometer using an engi- open or nonpressurized receiving vessel. An neered porous filtration media. They are typ- 7. Class II backflow hazard. See back- approved air-gap separation shall be at least ically constructed of a non-rigid, fabric filtra- flow hazard. twice the diameter of the system pipe mea- tion media housed in a pressure vessel in 8. Coagulation. A process using coagu- sured vertically above the overflow rim of the which the direction of flow is from the inside lant chemicals and mixing by which colloidal vessel. In no case shall the distance be less of the bag to the outside. and suspended materials are destabilized and than one inch (1"). 6. Bank filtration. Water treatment pro- agglomerated into flocs. 3. Alpha particle. A particle identical cess that uses a well to recover surface water 9. Combined chlorine residual. That with a helium nucleus, emitted from the that has naturally infiltrated into ground portion of the total chlorine residual which is nucleus of a radioactive element. water through a river bed or bank(s). not free available chlorine. 4. Applicant. The legal name of the pub- Infiltration is typically enhanced by the 10. Combined distribution system. The lic water system for purposes of 10 CSR-60. hydraulic gradient imposed by a nearby interconnected distribution system consisting 5. Auxiliary intake. Any piping, connec- pumping water supply or other well(s). of the distribution systems of wholesale sys- tion, or device whereby water may be secured 7. Best available technology. The best tems and of the consecutive systems that from a source other than the primary source. technology, treatment, or other means which receive finished water. 6. Auxiliary water system. Any supply the department finds, after examination for 11. Community water system. A public or source of water other than the approved efficacy under field conditions and not solely water system which serves at least fifteen public water system. under laboratory conditions, are available (15) service connections and is operated on a (B) Terms beginning with the letter B. (taking cost into consideration). For the pur- year-round basis or regularly serves at least 1. Backflow. The undesirable reversal of pose of setting maximum contaminant levels twenty-five (25) residents on a year-round flow of water or mixtures of water and other for synthetic organic chemicals, any best basis.

ROBIN CARNAHAN (9/30/09) CODE OF STATE REGULATIONS 3 Secretary of State 10 CSR 60-2—DEPARTMENT OF NATURAL RESOURCES Division 60—Safe Drinking Water Commission

12. Compliance cycle. The nine (9)-year lowed by secondary rapid mix, flocculation, fectant concentration (C) is measured as calendar year cycle during which public water and sedimentation, operated in series, fol- determined by a department-approved study systems must monitor. Each compliance cycle lowed by filtration and disinfection contact as outlined in the Missouri Guidance Manual consists of three (3), three (3)-year compli- storage. Raw water quality characteristics for Surface Water System Treatment ance periods. The first calendar year cycle may require additional treatment. Requirements, 1992. begins January 1, 1993 and ends December 20. Corrosion inhibitor. A substance 6. Disinfection. A process which inacti- 31, 2001; the second begins January 1, 2002 capable of reducing the corrosivity of water vates pathogenic organisms in water by chem- and ends December 31, 2010; and the third toward metal plumbing materials, especially ical oxidants or equivalent agents. begins January 1, 2011 and ends December lead and copper, by forming a protective film 7. Domestic or other nondistribution 31, 2019. on the interior surface of those materials. system plumbing problem. A coliform con- 13. Compliance period. A three (3)-year 21. Cross-connection. Any actual or tamination problem in a public water system calendar year period within a compliance potential connection or structural arrange- with more than one (1) service connection cycle. Each compliance cycle has three (3), ment between a public water system and any that is limited to the specific service connec- three (3)-year compliance periods. Within the other source or system through which it is tion from which the coliform-positive sample first compliance cycle, the first compliance possible to introduce into any part of the pub- was taken. period runs from January 1, 1993 to lic water system any used water, industrial 8. Dose equivalent. The product of the December 31, 1995; the second from January fluid, gas, or substance other than the intend- absorbed dose from ionizing radiation and 1, 1996 to December 31, 1998; and the third ed potable water with which the system is factors that account for difference in biologi- from January 1, 1999 to December 31, 2001. supplied. By-pass arrangements, jumper con- cal effectiveness due to the type of radiation 14. Confluent growth. A continuous nections, removable sections, swivel or and its distribution in the body as specified by bacterial growth covering the entire filtration change-over devices, and other temporary or the International Commission of Radiological area of a membrane filter, or a portion of the permanent devices through which or because Units and Measurements (ICRU). area, in which bacterial colonies are not dis- of which, backflow can or may occur are 9. Double check valve assembly. A crete. considered to be cross-connections. backflow prevention assembly composed of 15. Consecutive system. A public water 22. CT. The product of the residual dis- two (2) single, independently acting, internal- system that receives some or all of its finished infectant concentration (C) in milligrams per ly spring loaded, approved check valves water from one (1) or more wholesale sys- liter (mg/l) determined before or at the first including tightly closing resilient-seated shut- tems. Delivery may be through a direct con- customer and the corresponding disinfectant off valves located at each end of the assembly nection or through the distribution system of contact time (T) in minutes (that is, C multi- and fitted with properly located test cocks. one (1) or more consecutive systems. plied by T (C × T)). (See also residual dis- 10. Dual sample set. A set of two (2) 16. Consolidated formations. Earth infectant concentration and disinfectant con- samples collected at the same time and same material which has been created by geologi- tact time.) location, with one (1) sample analyzed for cal processes, cemented, or compacted into a 23. Customer. Any person who receives total trihalomethanes (TTHM) and the other coherent or firm mass. water from a public water system. sample analyzed for haloacetic acids 5 17. Containment. Protection of the pub- 24. Customer service line. The pipeline (HAA5). Dual sample sets are collected for lic water system by installation of a depart- from the public water system to the first tap, the purposes of conducting an initial distribu- ment-approved backflow prevention assembly fixture, receptacle, or other point of customer tion system evaluation (IDSE) and determin- or air-gap separation at the user connection water use or to the first auxiliary water sys- ing compliance with the TTHM and HAA5 from the main service line(s). tem or pipeline branch in a building. maximum contaminant levels (MCLs) under 18. Contaminant. Any physical, chemi- 25. Customer water system. All piping, Stage 2 Disinfectants/Disinfection By- cal, biological, or radiological substances or fixtures, and appurtenances, including auxil- Products requirements. matter in water including, but not limited to, iary water systems, used by a customer to (E) Terms beginning with the letter E. those substances for which maximum con- convey water on his/her premises. 1. Effective corrosion inhibitor residual. taminant levels are established by the depart- (D) Terms beginning with the letter D. For the purpose of the lead and copper provi- ment. 1. Department. The Missouri sions of these rules, a concentration sufficient 19. Conventional filtration treatment. A Department of Natural Resources. to form a protective film on the interior walls series of treatment processes including coag- 2. Department of Health. The Missouri of a pipe. ulation, flocculation, sedimentation, and fil- Department of Health and Senior Services. 2. Engineer. An individual registered as tration resulting in substantial particulate 3. Director. The director of the Missouri a professional engineer in Missouri. removal. Department of Natural Resources. 3. Enhanced coagulation. The addition A. Required treatment for ground 4. Disinfectant. Includes, but is not lim- of sufficient coagulant for improved removal water systems under the direct influence of ited to, chlorine, chlorine dioxide, chlo- of disinfection byproduct precursors by con- surface water. One (1) stage of treatment ramines, and ozone added to water in any ventional filtration treatment. must be provided as follows: rapid mix, floc- part of the treatment or distribution process, 4. Enhanced softening. The improved culation, and sedimentation followed by fil- that is intended to kill or inactivate removal of disinfection byproduct precursors tration. Disinfection also shall be provided. pathogenic microorganisms. by precipitative softening. Raw water quality characteristics may require 5. Disinfectant contact time. The “T” in (F) Terms beginning with the letter F. additional treatment. the equation CT. The time in minutes that it 1. Facility. A single tract or contiguous B. Required treatment for surface takes for water to move from the point of dis- tracts of land and any improvements on them, water systems. Two (2) stages of treatment infectant application or the previous point of upon which one (1) or more service connec- must be provided as follows: primary rapid disinfectant residual measurement to a point tions are located, and which, except for ease- mix, flocculation, and sedimentation fol- before or at the point where residual disin- ments and public right-of-way, are wholly

4 CODE OF STATE REGULATIONS (9/30/09) ROBIN CARNAHAN Secretary of State Chapter 2—Definitions 10 CSR 60-2

owned, leased, or otherwise subject to the 5. Ground water under the direct influ- manganese, or radionuclides from source control of the customer. ence of surface water (GWUDISW). Any water. 2. Filter profile. A graphical representa- water beneath the surface of the ground with 5. Locational running annual average tion of individual filter performance, based either of the following: (LRAA). The average of sample analytical on continuous turbidity measurements or A. Significant and relatively rapid results for samples taken at a particular mon- total particle counts versus time for an entire shifts in water characteristics such as turbidi- itoring location during the previous four (4) filter run, from startup to backwash inclu- ty, temperature, conductivity, or pH which calendar quarters. sively, that includes an assessment of filter closely correlate to climatological or surface (M) Terms beginning with the letter M. performance while another filter is being water conditions. Direct influence must be 1. Man-made beta particle and photon backwashed. determined for individual sources in accor- emitters. All radionuclides emitting beta par- 3. Filtration. A process for removing dance with criteria established by the depart- ticles, photons, or both, except the daughter particulate matter from water by passage ment. The department’s determination of products of thorium 232, uranium 235, and through porous media. direct influence may be used on site-specific uranium 238, listed in the EPA 4. Finished water. Water that is intro- measurements of water quality or documenta- Implementation Guidance for Radionuclides, duced into the distribution system of a public tion of well construction characteristics, or Appendix J. water system and is intended for distribution both, and geology with field evaluation; or 2. Maximum contaminant level (MCL). and consumption without further treatment, B. Significant occurrence of insects or The maximum permissible level, as estab- except treatment necessary to maintain water other macroorganisms, algae, or large-diam- lished in 10 CSR 60-4, of a contaminant in quality in the distribution system (for exam- eter pathogens such as Giardia lamblia or any water which is delivered to any user of a ple, booster disinfection, addition of corro- Cryptosporidium. public water system. sion control chemicals). (H) Terms beginning with the letter H. 3. Maximum contaminant level goal 5. Finished water storage facility. A 1. Haloacetic acids (five) (HAA5). The (MCLG). A level of a contaminant in drink- tank, reservoir, or other man-made facility sum of the concentrations in milligrams per ing water at which no known or anticipated used to store potable water that will undergo liter of the haloacetic acid compounds adverse effect on the health of persons would no further treatment except residual disinfec- (monochloroacetic acid, dichloroacetic acid, occur and which allows an adequate margin tion. trichloroacetic acid, monobromoacetic acid, of safety. MCLGs are nonenforceable health 6. First draw sample. A one (1) liter and dibromoacetic acid), rounded to two (2) goals. sample of tap water, collected in accordance significant figures after addition. 4. Maximum residual disinfectant level with the lead and copper provisions of these (I) Terms beginning with the letter I. (MRDL). A level of a disinfectant that may rules only, that has been standing in plumb- 1. Initial Compliance Period. That peri- not be exceeded at the consumer’s tap with- ing pipes at least six (6) hours and is collect- od beginning January 1, 1993, for existing out an unacceptable possibility of adverse ed without flushing the tap. sources. For new water supply sources, the health effects. 7. Flocculation. A process to enhance first full three (3)-year compliance period 5. Maximum residual disinfectant level the collection of smaller floc particles into which begins no more than eighteen (18) goal (MRDLG). The maximum level of a dis- larger, more easily settleable particles months after the source is placed in service. infectant added for water treatment at which through gentle stirring by hydraulic or 2. Iron removal. The removal of iron mechanical means. and manganese from a ground water source no known or anticipated adverse effect on the 8. Flowing stream. A course of running with the treated water being exposed to aera- health of persons would occur, and which water flowing in a definite channel. tion and chemical oxidation, pH adjustment, allows an adequate margin of safety. (G) Terms beginning with the letter G. sedimentation and filtration. MRDLGs are nonenforceable health goals 1. GAC10. Granular activated carbon (J) Terms beginning with the letter J. and do not reflect the benefit of the addition filter beds with an empty-bed contact time of (Reserved) of the chemical for control of waterborne ten (10) minutes based on average daily flow (K) Terms beginning with the letter K. microbial contaminants. and a carbon reactivation frequency of every (Reserved) 6. Maximum total trihalomethane poten- one hundred eighty (180) days, except that (L) Terms beginning with the letter L. tial (MTTHMP). The maximum concentra- the reactivation frequency for GAC10 used as 1. Lake/reservoir. A natural or man- tion of total trihalomethanes produced in a a best available technology for compliance made basin or hollow on the earth’s surface given water containing a disinfectant residual with Stage 2 Disinfectants/Disinfection By- in which water collects or is stored that may after seven (7) days at a temperature of twen- Products is one hundred twenty (120) days. or may not have a current or single direction ty-five degrees Celsius (25 °C) or above. 2. GAC20. Granular activated carbon of flow. 7. Membrane filtration. Pressure or filter beds with an empty-bed contact time of 2. Lead service line. A service line vacuum driven separation process in which twenty (20) minutes based on average daily made of lead which connects the water main particulate matter larger than one (1) flow and a carbon reactivation frequency of to the building inlet and any lead pigtail, micrometer is rejected by an engineered bar- every two hundred forty (240) days. gooseneck, or other fitting which is connect- rier, primarily through a size-exclusion 3. Gross alpha particle activity. The ed to that lead line. mechanism, and which has a measurable total radioactivity due to alpha particle emis- 3. Legionella. A genus of bacteria some removal efficiency of a target organism that sion as inferred from measurements on a dry species of which have caused a type of pneu- can be verified through the application of a sample. monia called Legionnaires disease. direct integrity test. This definition includes 4. Gross beta particle activity. The total 4. Lime softening. The application of the common membrane technologies of radioactivity due to beta particle emission as lime to reduce the concentrations of calcium microfiltration, ultrafiltration, nanofiltration, inferred from measurements on a dry sample. and magnesium and, to a lesser extent, iron, and reverse osmosis.

ROBIN CARNAHAN (9/30/09) CODE OF STATE REGULATIONS 5 Secretary of State 10 CSR 60-2—DEPARTMENT OF NATURAL RESOURCES Division 60—Safe Drinking Water Commission

8. Missouri Safe Drinking Water Law. 6. Presedimentation. A preliminary excess of ten thousand (10,000) inhabitants The Revised Statutes of Missouri, sections treatment process used to remove gravel, according to the latest reliable population 640.100 through 640.140. sand, and other particulate material from the estimate for purposes of 10 CSR 60-13.010. (N) Terms beginning with the letter N. source water through settling before the water (S) Terms beginning with the letter S. 1. Near the first service connection. At enters the primary clarification and filtration 1. Sanitary survey. An on-site engineer- one (1) of the twenty percent (20%) of all ser- processes in a treatment plant. ing inspection and review of a public water vice connections in the entire system that are 7. Primary public water system. A pub- system—its supply source(s), treatment of nearest the water supply treatment facility, as lic water system which obtains its source of supply source(s), treatment facilities, and dis- measured by water transport time within the water directly from a well, infiltration tribution system(s), for the purpose of evalu- distribution system. gallery, lake, reservoir, river, spring, or ating their adequacy, reliability, and safety for 2. Nontransient noncommunity water stream. producing and distributing drinking water. system. A public water system that is not a 8. Public water system. A system for the 2. Secondary contaminant levels. Those community water system and that regularly provision to the public of piped water for contaminant levels established by the depart- serves at least twenty-five (25) of the same human consumption, if the system has at least ment for contaminants which may affect the persons over six (6) months per year. fifteen (15) service connections or regularly taste, odor, color, staining, and scale-forming (O) Terms beginning with the letter O. serves an average of at least twenty-five (25) tendencies of water. 1. On-site inspection. An on-site review individuals daily at least sixty (60) days out of 3. Secondary public water system. A of the water source, facilities, equipment, the year. The system includes any collection, public water system which obtains all its operation, and maintenance of a public water treatment, storage, or distribution facilities water from an approved public water sys- system for the purpose of evaluating the ade- used in connection with the system. A public tem(s), consists of a water distribution sys- quacy of that source, facilities, equipment, water system is either a community water system, and resells the water or is a carrier operation, and maintenance for producing tem or a noncommunity water system. which conveys passengers in interstate com- and distributing safe drinking water. (Q) Terms beginning with the letter Q. merce. Parts of a primary public water system 2. Operator. Any individual who oper- 1. Quarterly. Unless otherwise specified may be classified as being a secondary public ates or determines the methods of operating a in 10 CSR 60, quarterly refers to the calen- water system if they meet this definition and water system, either directly or by order. dar quarters, January through March, April are physically separated from those parts through June, July through September, and served by the source for the primary public 3. Optimal corrosion control treatment. October through December. water system. For the purpose of the lead and copper provi- (R) Terms beginning with the letter R. 4. Sedimentation. A process for removal sions of these rules only, means the corrosion 1. Radioactivity. The spontaneous, of solids before filtration by gravity separa- control treatment that minimizes the lead and uncontrollable disintegration of the nucleus of tion. copper concentrations at users’ taps while an atom with the emission of particles and 5. Service connection. Any water line or insuring that the treatment does not cause the rays. pipe connected to a water distribution main water system to violate any other drinking 2. Rapid mix. The rapid dispersion of or pipe for the purpose of conveying water to water regulations. chemicals throughout the water to be treated a point of use. (P) Terms beginning with the letter P. by violent agitation. 6. Service line sample. A one (1) liter 1. Person. Any individual, partnership, 3. Reduced pressure principle backflow sample of water, collected in accordance with co-partnership, firm, company, public or pri- prevention assembly. A device containing two the lead and copper provisions of these rules vate corporation, association, homeowners’ (2) independently acting, internally spring only, that has been standing for at least six (6) association, joint stock company, trust, loaded, approved check valves, together with hours in a service line. estate, political subdivision or any agency, a hydraulically operating, mechanically inde- 7. Single family structure. For the pur- board, department, or bureau of the state or pendent pressure differential relief valve pose of the lead and copper provisions of federal government, or any other legal entity located between the check valves and below these rules only, a building constructed as a whatever, which is recognized by law as the the first check valve. The unit shall include single family residence that is currently used subject of rights and duties. properly located test cocks and tightly clos- as either a residence or a place of business. 2. Picocurie (pCi). The quantity of ing, resilient-seated shut-off valves at each 8. Subdivision. Any land which is divid- radioactive material producing 2.22 nuclear end of the assembly. ed or proposed to be divided into fifteen (15) transformations per minute. 4. Rem. The unit of dose equivalent or more lots or tracts, whether contiguous or 3. Plant intake. The works or structures from ionizing radiation to the total body or not, for the purpose of sale, lease, rental, or at the head of a conduit through which water any internal organ or organ system. A mil- construction of permanent structures on lots is diverted from a source (for example, river lirem (mrem) is one one-thousandth (1/1000) or tracts as part of a common plan; or where or lake) into the treatment plant. of a rem. subdivided land is offered for sale or lease, or 4. Point of entry treatment device 5. Repeat compliance period. Any sub- where structures are constructed by a single (POE). A treatment device applied to the sequent compliance period after the initial developer or a group of developers acting in drinking water entering a house or other compliance period. concert and where the lots or land or struc- building for the purpose of reducing contam- 6. Residual disinfectant concentration. tures are contiguous or known, designated or inants in the drinking water distributed The “C” in the equation CT. The concentra- advertised as a common unit or by a common throughout the house or building. tion of disinfectant measured in milligrams name. The lots or land tracts and structures 5. Point of use treatment device (POU). per liter (mg/L) in a representative sample of shall be presumed, without regard to the A treatment device applied to a single tap for water. number of lots or dwellings covered by each the purpose of reducing contaminants in the 7. Rural. Shall not include any area in individual offering, as being offered for sale drinking water at that tap. any city or town which has a population in or lease as part of a common plan.

6 CODE OF STATE REGULATIONS (9/30/09) ROBIN CARNAHAN Secretary of State Chapter 2—Definitions 10 CSR 60-2

9. Supplier of water. Any person who 2. Uncovered finished water storage Amended: Filed July 11, 1986, effective Jan. owns, controls, or operates a public water facility. A tank, reservoir, or other facility 1, 1987. Amended: Filed June 2, 1988, effec- system. used to store water that will undergo no fur- tive Aug. 31, 1988. Amended: Filed Dec. 4, 10. Surface water. All water which is ther treatment to reduce microbial pathogens 1990, effective July 8, 1991. Amended: Filed open to the atmosphere and subject to surface except residual disinfection and is directly July 12, 1991, effective Feb. 6, 1992. runoff; this includes all tributary streams and open to the atmosphere. (Note: uncovered Amended: Filed March 31, 1992, effective drainage basins, natural lakes, and artificial finished water storage facilities are prohibited Dec. 3, 1992. Amended: Filed Aug. 4, 1992, reservoirs above the point of the water supply under 10 CSR 60-4.080(7).) effective May 6, 1993. Amended: Filed Dec. intake. (V) Terms beginning with the letter V. 14, 1992, effective Aug. 9, 1993. Amended: 11. System with a single service con- 1. Virus. A virus of fecal origin which Filed May 4, 1993, effective Jan. 13, 1994. nection. A system which supplies drinking is infectious to humans by waterborne trans- Amended: Filed Feb. 1, 1996, effective Oct. water to consumers via a single service line. mission. 30, 1996. Amended: Filed Jan. 2, 1997, (T) Terms beginning with the letter T. (W) Terms beginning with the letter W. effective Dec. 29, 1997. Amended: Filed Dec. 1. Too numerous to count (TNTC). The 1. Water distribution system. All piping, 15, 1999, effective Sept. 1, 2000. Amended: total number of bacterial colonies exceeds conduits, valves, hydrants, storage facilities, Filed March 17, 2003, effective Nov. 30, two hundred (200) on a forty-seven millime- pumps, and other appurtenances, excluding 2003. Amended: Filed Feb. 27, 2009, effec- ter (47 mm) diameter membrane filter used service connections, which serve to deliver tive Oct. 30, 2009. for coliform detection. water from a water treatment plant or water 2. Total organic carbon (TOC). Total supply source to the public. *Original authority: 640.100, RSMo 1939, amended 1978, 1981, 1982, 1988, 1989, 1992, 1993, 1995, 1996, 1998, organic carbon in milligrams per liter (mg/l) 2. Water system. All sources from 1999, 2002, 2006. measured using heat, oxygen, ultraviolet irra- which water is derived for drinking or diation, chemical oxidants, or combinations domestic use by the public, also all struc- of these oxidants that convert organic carbon tures, conduits, and appurtenances by means 10 CSR 60-2.020 Grants for Public Water to carbon dioxide, rounded to two (2) signif- of which water for use is treated, stored, or Supply Districts, Sewer Districts, Rural icant figures. delivered to consumers, except service con- Community Water Supply and Sewer 3. Total trihalomethanes (TTHM). The nections from water distribution systems to Systems and Certain Municipal Sewer sum of the concentration in mg/l of the tri- buildings and plumbing within or in connec- Systems halomethane compounds, trichloromethane tion with buildings served. (Moved to 10 CSR 60-13.010) (chloroform), dibromochloromethane, bro- 3. Water supply source. All sources of modichloromethane, and tribromomethane water supply including wells, infiltration gal- (bromoform), rounded to two (2) significant leries, springs, reservoirs, lakes, streams, or figures. rivers from which water is derived for public 4. Transient noncommunity water sys- water systems, including the structures, con- tem. A public water system that is not a com- duits, pumps, and appurtenances used to munity water system, which has at least fif- withdraw water from the source or to store or teen (15) service connections or regularly transport water to the water treatment facility serves an average of at least twenty-five (25) or water distribution system. individuals daily at least sixty (60) days out of 4. Water treatment facility. A facility the year. which uses specific processes such as sedi- 5. Treated water. Water which is han- mentation, coagulation, filtration, disinfec- dled or processed in any manner to change tion, aeration, oxidation, ion exchange, fluo- the physical, chemical, biological, or radio- ridation, or other processes which serve to logical content and includes water exposed to add components or to alter or remove con- the atmosphere by aeration. taminants from a water supply source. 6. Trihalomethane (THM). One (1) of 5. Waterborne disease outbreak. The the family of organic compounds, named as significant occurrence of acute infectious ill- derivatives of methane, where three (3) of the ness associated with the ingestion of water as four (4) hydrogen atoms in methane are each declared by the Department of Health and substituted by a halogen atom in the molecu- Senior Services. lar structure. 6. Wholesale system. A public water 7. Two (2)-stage lime softening. A pro- system that treats source water as necessary cess in which chemical addition and hardness to produce finished water and then delivers precipitation occur in each of two (2) distinct some or all of that finished water to another unit clarification processes in series prior to public water system. Delivery may be filtration. through a direct connection or through the (U) Terms beginning with the letter U. distribution system of one (1) or more con- 1. Unconsolidated formations. Earth secutive systems. material (sand, gravel, silt, clay) which is uncemented and uncompacted and which has AUTHORITY: section 640.100, RSMo Supp. been deposited by a natural process. This 2008.* Original rule filed May 4, 1979, material retains loose or relatively soft phys- effective Sept. 14, 1979. Amended: Filed ical characteristics. April 14, 1981, effective Oct. 11, 1981.

ROBIN CARNAHAN (9/30/09) CODE OF STATE REGULATIONS 7 Secretary of State