Types of Stormwater Pollution

Lawn Maintenance

  • Landscaping debris, leaves, grass clippings and sediment must be recycled, composted or disposed of properly. They should not by hosed, swept or blown into a stormwater drain for disposal. 
  • Pesticides, fertilizers, and herbicides should be used wisely. Use only when other methods fail, in accordance with manufacturer's instructions, and do not apply if rain is in the forecast. 
  • Remove debris and litter such as drink containers, bags and cigarette butts from parking areas and stormwater systems and recycle or dispose of properly as needed. 
  • Keep the lids on all garbage and recycling compactors, dumpsters or other containers. Do not permit liquid draining from these containers to find its way to the stormwater drains. 

Chemical, Fertilizers, Pesticides, and Paint Management:

  • Store and label substances properly and out of potential flood areas to avoid leaks and spills. 
  • Clean up spills immediately and dispose of properly. 
  • Properly manage all excess or dated products through established waste collection programs or donate unused portions such as paints to local organizations. 

Swimming Pools:


  • Swimming pool discharge can be a source of illicit discharges in municipal separate storm sewer systems (MS4). Chlorine and other chemicals used in maintaining pools and spas, which often include acidic or alkaline cleaning compounds, can have a negative impact on the plant and aquatic life in surface waters. Even at low levels, chlorine can be toxic to aquatic life. 
  • Pool Drainage Brochure
  • Pool Drainage Flyer

Storm Drains and the Environment


  • All storm drains in Southlake drain directly to a natural waterway. Anything that enters a storm drain eventually makes it to a pond, lake, creek, or river.
  • Please keep this in mind when considering what you are discharging in your neighborhood. Chemicals, trash, and other materials can change water quality, disrupt habitat or kill wildlife. 

Pool Water Discharge Tips:

  • Only drain your pool when necessary. Avoid draining/backwashing your pool during periods of drought and during significant rainfall events. Do not drain your pool when watering restrictions are in place.
  • Test the free chlorine residual before discharging. A free chlorine residual should not be detected. The chlorine residual can be tested using a standard pool test kit. 
  • The water should be clear and free of solids. The pH must be between 6.5 and 8.5 before it is discharged. 
  • Algaecides containing copper or silver can interrupt normal algal and plant growth in the surface water bodies and should be used with caution. Follow the manufacturer's instructions before discharging water that had an algaecide added recently. 
  • Control the rate of discharge across your property to avoid erosion and nuisance conditions for neighboring properties. Nuisance conditions such as the creation of odors, mosquito breeding conditions, or flooding can occur when water is ponded for a prolonged period. 
  • Direct the discharge over a vegetated surface so that some level of filtration can occur. Do not discharge on areas recently treated with herbicides or pesticide 

Dog Waste

  • When pet waste is improperly disposed of, it can be picked up by stormwater runoff and washed into storm drains or nearby waterbodies. Since storm drains do not always connect to treatment facilities, untreated animal feces often end up in lakes and streams, causing significant water pollution. 
  • Decaying pet waste consumes oxygen and sometimes releases ammonia. Low oxygen levels and ammonia can damage the health of fish and other aquatic life. Pet waste carries bacteria, viruses, and parasites that can threaten the health of humans and wildlife.