Permit Watch #3: Austin, TX — Mobile Wash Water Can't Go Down the Storm Drain

Permit Watch #3: Austin, TX — Mobile Wash Water Can't Go Down the Storm Drain

PERMIT WATCH #3: Austin, TX — mobile wash water can't go down the storm drain, and there's no city dump site for it either.

In Austin, Texas, a mobile car wash operator's wastewater problem starts before the first job, not after it. Austin Water's own guidance says the city's power-washing wastewater rules apply equally to mobile car washes — and they leave only one lawful route for the dirty water: collect it, haul it, and discharge it at a permitted private facility.

The first ban is absolute in practice: mobile car wash wastewater may not be discharged into the storm sewer if it contains pollutants or cleaning compounds and has not been treated before entering the environment. The applicable code is Article 5 of Chapter 6-5 of the Austin City Code. A driveway drain, a gutter, or a storm inlet is not a disposal plan.

The second route is narrow. Wash water may go to the sanitary sewer only under conditions set out in Chapter 15-10 (Wastewater Regulations): it must be collected and transported to a private fixed-site facility connected to the city's sanitary sewer collection system. To establish such a facility, the operator must submit a Discharge Permit Application — all industrial wastewater discharges must be authorized by permit — ensure the facility has appropriate pretreatment such as a sand/oil interceptor or grit trap, and let Austin Water determine whether a wastewater flow meter is required for billing and surcharge fees.

Two common shortcuts are closed. Hauled industrial wastewater may not be disposed of at the city's Approved Receiving Station, and it may not be dumped into a cleanout, manhole, or toilet at the site being cleaned unless that site is permitted by Austin Water and has an appropriately sized sand/oil interceptor. Local landfills and centralized waste treatment facilities may accept hauled liquid waste, but the operator must confirm directly with each facility whether it can take that waste type.

The penalty gives the rule teeth: unauthorized discharge into the sanitary sewer system violates Chapter 15-10, is a Class C misdemeanor, and is punishable by a fine of up to $2,000 per day per violation.

What it means in practice: a mobile washer working in Austin needs a disposal arrangement lined up before taking jobs — a permitted private receiving facility with pretreatment — not just a containment mat and a tank. The tank only holds the problem; the permit decides where it legally ends. For the basics of where wash water is allowed to go, see Compliance Week Day 1: Where Your Wash Water Is Allowed to Go, and for the containment gear that keeps it out of the drain, see Compliance Week Day 2: The Simple Containment Setup.

What to check before operating there: contact Austin Water's Utility Compliance Services Division at 512-972-1060, option 5, before beginning operations to confirm your disposal plan is compliant, and confirm your receiving facility's permit and interceptor before you haul a load there.

Source: City of Austin / Austin Water, Wastewater Disposal for Power Washers & Mobile Car Washes — https://www.austintexas.gov/department/wastewater-disposal-power-washers-mobile-car-washes

Informational only, not legal advice — verify with the city's permit office.