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Department of Natural Resources Division 20—Clean Water Commission Chapter 7—Water Quality

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Department of Natural Resources Division 20—Clean Water Commission Chapter 7—Water Quality Rules of Department of Natural Resources Division 20—Clean Water Commission Chapter 7—Water Quality Title Page 10 CSR 20-7.010 Prevention of Pollution from Wells to Subsurface Waters of the State (Rescinded July 10, 1980) ...................................................................3 10 CSR 20-7.015 Effluent Regulations............................................................................3 10 CSR 20-7.020 Effluent Regulations (Rescinded July 10, 1980).........................................12 10 CSR 20-7.030 Water Quality Standards (Rescinded December 11, 1977).............................12 10 CSR 20-7.031 Water Quality Standards .....................................................................12 10 CSR 20-7.050 Methodology for Development of Impaired Waters List ..............................150 JASON KANDER (1/29/14) CODE OF STATE REGULATIONS 1 Secretary of State Chapter 7—Water Quality 10 CSR 20-7 Title 10—DEPARTMENT OF 4. Representative sample—a small quan- 4. Metropolitan no-discharge streams. NATURAL RESOURCES tity whose characteristics represent the nature These streams and the limitations on dis- Division 20—Clean Water Commission and volume of the whole. For permitting pur- charging to them are listed in Table F of 10 Chapter 7—Water Quality poses representative sampling shall be consis- CSR 20-7.031 Water Quality Standards; tent with 40 CFR Part 122.48. 5. Special streams—Outstanding Nation- 10 CSR 20-7.010 Prevention of Pollution 5. Toxic Unit—a measure of effluent al Resource Waters and Outstanding State from Wells to Subsurface Waters of the toxicity generally expressed as acute toxicity Resource Waters, as listed in Tables D and E State unit or chronic toxicity unit. The larger the of 10 CSR 20-7.031 (section (6) of this rule); (Rescinded July 10, 1980) toxicity unit, the greater the toxicity. 6. Subsurface waters in aquifers (section 6. Toxic Unit–Acute—one-hundred (7) of this rule); and AUTHORITY: section 204.026, RSMo 1978. (100) times the reciprocal of the effluent con- 7. All other waters except as noted in Original rule filed June 19, 1974, effective centration that causes fifty percent (50%) of paragraphs (1)(B)1.–6. of this rule (section June 29, 1974. Amended: Filed April 1, the organisms to die in an acute toxicity test. (8) of this rule). 1975, effective April 11, 1975. Rescinded: 7. Toxic Unit–Chronic—one-hundred (C) Sections (2) though (8) of this rule Filed Oct. 12, 1979, effective July 10, 1980. (100) times the reciprocal of the highest efflu- establish requirements for discharges to the ent concentration that causes no observable waters specified in these sections, and the effect on the test organism in a chronic toxi- requirements of section (9) of this rule apply 10 CSR 20-7.015 Effluent Regulations city test. to all discharges. The requirements of this (B) For the purpose of this rule, the waters rule do not apply to stormwater discharges; PURPOSE: This rule sets forth the limits for of the state are divided into the following cat- effluent limits for stormwater discharges are various pollutants which are discharged to egories: prescribed in 10 CSR 20-6.200 Storm Water the various waters of the state. The two pre- 1. The Missouri and Mississippi Rivers Regulations. vious rules 10 CSR 20-6.050 and 10 CSR 20- (section (2) of this rule); 7.010 have been rescinded and this rule com- 2. Lakes and reservoirs, including natu- (2) Effluent Limitations for the Missouri and bines certain aspects of both rules and ral lakes and any impoundments created by Mississippi Rivers. In addition to the require- modifies the format of the effluent regula- the construction of a dam across any water- ments of section (9) of this rule, the following tions. This rule also complies with the latest way or watershed. An impoundment designed limitations represent the maximum amount of changes to the Federal Clean Water Act, P.L. for or used as a disposal site for tailings or pollutants which may be discharged from any 97-117 (1981). sediment from a mine or mill shall be con- point source, water contaminant source, or sidered a wastewater treatment device and not wastewater treatment facility. PUBLISHER’S NOTE: The secretary of state a lake or reservoir. Releases to lakes and (A) Discharges from wastewater treatment has determined that the publication of the reservoirs include discharges into streams facilities which receive primarily domestic entire text of the material which is incorpo- one-half (1/2) stream mile (.80 km) before waste or from publicly-owned treatment works rated by reference as a portion of this rule the stream enters the lake as measured to its (POTWs) shall undergo treatment sufficient to would be unduly cumbersome or expen- conservation pool (section (3) of this rule); conform to the following limitations: sive. This material as incorporated by refer- 3. A losing stream is a stream which dis- 1. Biochemical Oxygen Demand5 ence in this rule shall be maintained by the tributes thirty percent (30%) or more of its (BOD5) and Total Suspended Solids (TSS) agency at its headquarters and shall be made flow through natural processes such as equal to or less than a monthly average of thir- available to the public for inspection and through permeable geologic materials into a ty milligrams per liter (30 mg/L) and a week- copying at no more than the actual cost of bedrock aquifer within two (2) miles flow dis- ly average of forty-five milligrams per liter (45 reproduction. This note applies only to the tance downstream of an existing or proposed mg/L); reference material. The entire text of the rule discharge. Flow measurements to determine 2. pH shall be maintained in the range is printed here. percentage of water loss must be corrected to from six to nine (6–9) standard units; approximate the seven (7)-day Q10 stream 3. Exceptions to paragraphs (2)(A)1. (1) Designations of Waters of the State. flow. If a stream bed or drainage way has an and 2. of this rule are as follows: (A) Definitions. intermittent flow or a flow insufficient to mea- A. If the facility is a wastewater 1. Acute Toxicity Test—a test used to sure in accordance with this rule, it may be lagoon, the TSS shall be equal to or less than determine the concentration of an effluent determined to be a losing stream on the basis a monthly average of eighty milligrams per that causes an adverse effect (usually death) of channel development, valley configuration, liter (80 mg/L) and a weekly average of one in a group of test organisms during a short- vegetation development, dye tracing studies, hundred twenty milligrams per liter (120 term exposure. bedrock characteristics, geographical data, mg/L) and the pH shall be maintained above 2. Allowable Effluent Concentration— and other geological factors. Only discharges six 6.0, and the BOD5 shall be equal to or the concentration of a toxicant or the param- which in the opinion of the Missouri Depart- less than a monthly average of forty-five mil- eter toxicity in the receiving water after mix- ment of Natural Resources (department) reach ligrams per liter (45 mg/L) and a weekly ing, sometimes referred to as the receiving the losing section and which occur within two average of sixty-five milligrams per liter (65 water concentration or the in-stream waste (2) miles upstream of the losing section of the mg/L); concentration. stream shall be considered releases to a losing B. If the facility is a trickling filter 3. Chronic Toxicity Test—A short-term stream. A list of known losing streams is avail- plant the BOD5 and TSS shall be equal to or test, usually ninety-six (96) hours or longer able in the Water Quality Standards, 10 CSR less than a monthly average of forty-five mil- in duration, in which sub-lethal effects such 20-7.031 Table J—Losing Streams. Other ligrams per liter (45 mg/L) and a weekly as reduced growth or reproduction rates are streams may be determined to be losing by the average of sixty-five milligrams per liter (65 measured in addition to lethality. department (section (4) of this rule); mg/L); JASON KANDER (1/29/14) CODE OF STATE REGULATIONS 3 Secretary of State 10 CSR 20-7—DEPARTMENT OF NATURAL RESOURCES Division 20—Clean Water Commission C. Where the use of effluent limita- at five milligrams per liter (5 mg/L) less than designated in 10 CSR 20-7.031 as L2 and L3 tions set forth in this section is known or the regular BOD5 in the operating permit. which is publicly owned. Releases to lakes expected to produce an effluent that will (B) The suspended solids which are pre- and reservoirs include discharges into streams endanger or violate water quality, the depart- sent in stream water and which are removed one-half (1/2) stream mile (.80 km) before ment will set specific effluent limitations for during treatment may be returned to the same the stream enters the lake as measured to its individual dischargers to protect the water body of water from which they were taken, conservation pool. quality of the receiving streams. When a along with any additional suspended solids 1. Discharges from wastewater treat- waste load allocation is conducted for a resulting from the treatment of water to be ment facilities which receive primarily stream or stream segment, all permits for dis- used as public potable water or industrial domestic waste or from POTWs shall under- charges in the study area shall be modified to purposes using essentially the same process go treatment sufficient to conform to the fol- reflect the limits established in the study in as a public water treatment process.
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