Nampa's City Code If you see a concrete washout on Stormwater Best the street or near a storm drain, Management Practices please contact the Environmental (BMPs)

The City of Nampa's code Title 8, Chapter 4 Compliance Division. objectives are: Concrete A. To regulate the contribution of pollutants to the municipal separate storm sewer system (MS4) by storm water discharges by any user. B. To prohibit illicit connections and discharges to Washout the municipal separate storm sewer system. C. To establish legal authority to carry out all inspection, cost assessments, surveillance and monitoring procedures necessary to ensure compliance with this chapter. (Ord. 3431, 3-7-2005) For more information This code is intended to protect the water quality on correct concrete washout and natural habitats of our local surface and procedures, please contact: groundwater. When rainwater passes over impervious surfaces, it can pick up sediment and other particles, trash, nutrients, pathogens, and chemical pollutants that cause pollution. City of Nampa Environmental Compliance Division 500 12th Street South Stormwater that flows off site is not treated and will Nampa, ID 83651 enter storm drains ultimately flowing into nearby 208-565-5476 streams. Although it may seem that one site or [email protected] property wouldn't be able pollute a stream, the collection of everyone's pollution can pose a great threat to our local waters.

By managing stormwater runoff in our community we can improve the water quality of our local waters. Even if you are not near the water's edge, reducing the amount of stormwater that leaves your property can benefit the whole watershed. Environmental Impacts This can hinder plant growth and can of Concrete Washwater contaminate our local groundwater. Groundwater is amajor source of drinking water in the City of Nampa! Concrete is made by mixing cement, water, and aggregate materials. After concrete Stormwater is has been poured, the chutes from concrete Everywhere trucks, wheelbarrows and hand tools must be washed off before reuse. Concrete Washout Tips washout or washwater is very corrosive, having a pH of near 12 (household bleach Water that flows down storm drains does has a pH between 12-12.6). Concrete Do not dispose of washout into the street, not get treated at our local wastewater washwater also contains various metals, storm drains, drainage ditches or streams. treatment plant. Instead, it will flow sand, and sediment that can contaminate Use minimal water to wash out the chute, through a series of pipes that will our local natural resources. tools, wheel-barrows, and other discharge either directly or indirectly, equipment. into our local creeks, rivers, streams, and Carry a 5-gallon bucket or other portable lakes. To minimize potential water quality method of catching and containing pollution, we need to work together to washout. clean our stormwater at the source If a portable method is not available, a before it goes down storm drains. temporary washout area may be created using straw bales or a bermed area lined with a heavy duty plastic sheet. Washwater that is sitting on the ground, Secure bags of concrete after they have can directly or indirectly end up in our been opened. local waterways though stormwater Excess concrete (not washout) can be runoff. Once in our streams, creeks, or placed in small piles where it can be rivers it can harm wildlife. Rainwater disposed of as solid waste when dry. polluted with concrete washwater can When you pour concrete, you are percolate though the ground and alters responsible for the clean-up of all residue the soil's natural chemistry. and leftover concrete.