Williamson County, Texas

This Storm Water Management Plan (SWMP) was developed to prevent pollution from storm drainage systems to the maximum extent practicable, with control measures being phased in during the 5-year permit term. The SWMP addresses six minimum control measures (MCMs):

1. Public Education and Outreach on Storm Water Impacts
2.. Illicit Discharge Detection
3. Construction Site Storm Water Runoff Control
4. Post-Construction Storm Water Management in New Development and Redevelopment
5. Pollution Prevention/Good Housekeeping for Community Operations
6. Industrial Stormwater Sources (not applicable to Level 2 MS4’s


The Texas Pollutant Discharge Elimination System (TPDES) Permit requirements apply only to the portions of unincorporated Williamson County that are identified as urbanized areas. There are approximately 43 non-contiguous urbanized areas in unincorporated Williamson County. These areas are identified based on data in the 2010 US Census map. The map may be viewed at the 2010 Urbanized Area Map link.

Penalties under the Texas Litter Abatement Act:
Health and Safety Code 365

• CLASS C MISDEMEANOR:
Fine up to $500
5 pounds or less or a volume of 5 gallons or less

• CLASS B MISDEMEANOR:
Fine up to $2,000 and/or up to 180 days in jail
More than 5 pounds but less than 500 pounds or a volume of more than 5 gallons but less than 100 cubic feet

• CLASS A MISDEMEANOR:
Fine up to $4,000 and/or up to 1 year in jail
500 pounds or more but less than 1,000 pounds or has a volume of
100 cubic feet or more but less than 200 cubic feet; or

– dumping for a commercial purpose and weighing more than
5 pounds but less than 200 pounds or has a volume more than
5 gallons but less than 200 cubic feet.

• STATE JAIL FELONY:
Fine up to $10,000 and/or up to 2 years in State jail
1,000 pounds or more, has a volume of 200 cubic feet or more; or

– dumping for a commercial purpose and weighing 200 pounds or more,
has a volume of 200 cubic feet or more; or

– dumping a closed barrel or drum.