MS4 Permit Illicit Discharge Stormwater (Drainage) Utility
FEMA Floodplain Stormwater for Kids Lawn Care

Current Stormwater Hot Topic

New FEMA Floodplain Maps effective 12/20/2019

Swimming Pool Guidelines

The City of Round Rock works to prevent pollution of our creeks and rivers from stormwater and urban runoff through education and management.

What is stormwater?
Stormwater is, in essence, just what it sounds like, water from a storm. When it rains, water flows over driveways, parking lots, and streets, picking up pollutants as it flows into storm drains –  you know those openings along the curb you’re terrified of falling into or the caged hole in the middle of the parking lot you just know you’ll drop your keys into. Contrary to popular belief, when stormwater or anything else goes in the storm drain, it flows directly into the nearest creek, lake, or other body of water. No filter. No treatment. Just straight into the water you swim in, boat on, fish from, and well, you get the drift.SW vs Sewer2

What is the difference between the storm sewer system and the sanitary sewer system?
The water that goes down the sanitary sewer system (from sinks or toilets) flows to a wastewater treatment plant where it is treated and filtered prior to entering any water bodies.
The stormwater and urban runoff water that flows down driveways and streets and into the storm sewer system flows directly to our creeks, lakes, and rivers. Anything that enters a storm sewer system is discharged untreated into the waterbodies we use for swimming, fishing, and providing drinking water.

Report illegal dumping, plugged storm drains, and other drainage problems, at 512-218-7046 or via email.

Illicit Discharge

SW dumping-drainAn illicit discharge (illegal dumping) is any discharge into a storm drain that is not composed entirely of stormwater. Examples include dumping of automotive fluids, household hazardous waste, grass clippings, leaves, industrial waste, restaurant waste, etc. into the storm drains. With a few exceptions, anything other than the water that falls from the sky is an illicit discharge, and it is illegal. The only exceptions are discharges from dechlorinated swimming pools, residential car washing, and fire protection water.

To report a suspected illicit discharge, please contact stormwater staff or call 512-218-7046. Failure to remedy an illicit discharge notice can result in remediation costs and fines of $500 to $2000 per day.

Common sources of illicit discharges
• Sanitary Wastewater
• Household Cleaners
• Pesticides
• Chlorinated Pool Water
• Motor Oil
• Paints
• Weed Killers
• Laundry Wastewater

How Can You Help?
• Never sweep or blow leaves into a storm drain. Bag it and bring it to the recycling center.
• Dispose of used motor oil in these designated locations day or night, or at the Recycling Center during normal business hours.
• Follow directions on pesticides and fertilizers and avoid use when rain is forecasted.
• Pick up pet waste and dispose of it properly to keep bacteria and parasites out of our creeks.

The City of Round Rock adopted an Illicit Discharge Ordinance on March 11, 2010, to protect local water quality and to comply with the City’s MS4 permit issued by TCEQ and the EPA’s Clean Water Act.