Did you know swimming pool water can pollute our creeks, streams, and lakes? Even though it is safe for us, swimming pool water may contain chemicals that are harmful to aquatic life. Anything discharged into streets or storm drains goes directly to the nearest creek, stream, or lake without being treated. With the average pool holding about 19,000 gallons, improper disposal can adversely impact our waterways. Pools have a high concentration of chlorine which is toxic to fi sh and wildlife.
To prevent algae, many pools are treated with an algaecide, often containing copper or silver which can hinder natural plant growth along streams.
Where should I drain the water from my pool?
• Into your landscape for irrigation. Pools may be discharged onto your property if the water does not run off into streets or cause stagnant water.
• Into the sanitary sewer system via your home’s sewer clean-out. The sewer clean-out is usually a threaded cap about three to four inches in diameter.
• After approval by the Watershed Protection Department, into the storm drain system. Watershed Protection can be reached at (940) 349-7123 or (940) 349-7153 or send an email to Watershed@cityofdenton.com.
To obtain permission, pool water will have to meet the following criteria:
• Discontinue use of pool chemicals at least three days prior to discharge
• Dechlorinate water to non-detectable level of chlorine (< 0.1 mg/L)
• Clean any vegetation and debris from pool
• Monitor discharge rate to prevent erosion
• Freshwater pool water only (saltwater pools cannot be discharged to the storm drain)
Where can I discharge pool filter backwash water?
Swimming pool filter backwash should be discharged to the sanitary sewer. Though low in volume, it has a higher concentration of contaminants compared to pool water.
Denton City Code of Ordinances Ch. 26-189 prohibits discharge of pollutants to storm sewer or natural outlet except where suitable treatment has been provided or where a Federal National Pollution Discharge Elimination Systems (NPDES) permit is issued. Fines for violating section 26-189 of the City Code could equal up to $2,000 per violation, per day.