Texas Wastewater Discharge Permits: A Guide for Manufacturers

Updated November 2026 by Russell Carr, founder of Berg Compliance Solutions

In our experience, many Texas manufacturers don’t realize they may need a wastewater discharge permit. We regularly hear from companies that have been sending rinse water or cleaning water “down the drain for years” with no idea there was a problem.

What Counts as Industrial (Process) Wastewater?

Wastewater from restrooms, kitchens and break rooms is domestic sewage. Wastewater that comes from your manufacturing operations is different. Examples include:

• Parts rinsing and washing water
• Equipment and floor cleaning water
• Plating, finishing and metal treatment rinses
• Cooling tower and boiler blowdown
• Water from mixing, coating or other production processes

This “process” or “industrial” wastewater can carry heavy metals, solvents, oils or extreme pH that city treatment plants aren’t designed to handle.

Why You Can’t Just Pour It Down the Drain

Your floor drains and sinks usually connect to the city sewer, which carries everything to a publicly owned treatment works (POTW). Those plants are built to treat ordinary sewage, not industrial waste. Contaminants like metals and solvents can upset the treatment process or pass straight through into rivers and lakes.

Federal pretreatment rules (40 CFR 403.5) flatly prohibit sending certain pollutants to a POTW, including:

• Wastes that create a fire or explosion hazard, such as anything with a flashpoint below 140°F
• Corrosive discharges, and in no case wastewater with a pH below 5.0 unless the plant is designed for it
• Solids or viscous materials that can block sewer flow
• Petroleum oil, nonbiodegradable cutting oil or mineral oil products in amounts that cause problems
• Pollutants that release toxic gases, vapors or fumes
• Heat that raises the treatment plant’s temperature above 104°F

(Source: 40 CFR 403.5)

Who Issues Wastewater Discharge Permits in Texas?

It depends on where your wastewater goes:

• To the city sewer: Your local city or utility usually manages industrial discharges through its sewer use rules and permits. Cities with an approved pretreatment program issue their own industrial user permits. If your city doesn’t have an approved program, some industrial users (especially those covered by federal categorical standards) may be regulated by TCEQ instead. (Source: TCEQ)
• Directly to a creek, river, ditch or other surface water: That requires a Texas Pollutant Discharge Elimination System (TPDES) permit from TCEQ.
• Onto land, such as irrigation or evaporation: That typically requires a Texas Land Application Permit (TLAP) from TCEQ.

Many smaller Texas towns don’t have their own treatment plants, or haven’t developed a formal permit process. That’s common, and it creates even more confusion for manufacturers. Call the city that owns your sewer system and ask what they require.

Large Texas cities and utilities, including those serving Dallas, Fort Worth, Houston, Austin and San Antonio, run their own industrial pretreatment programs with permits, local discharge limits and sampling requirements.

Wastewater is only one piece of environmental compliance in Texas. Air permits, storm water and hazardous waste management are typically handled by TCEQ.

5 Steps to Find Out If You Need a Permit

1. Identify every non-sewage wastewater stream. Walk the plant and list each process that generates wastewater and where it drains.
2. Analyze the process. Determine what contaminants could end up in the water, such as metals (lead, cadmium, silver), solvents, oils or acids.
3. Test a representative sample. Have a certified environmental lab analyze it.
4. Stop discharging if there’s a problem. If results show regulated contamination, collect the wastewater in totes, 55-gallon drums or a storage tank instead of sending it down the drain. That buys time to decide how to treat or dispose of it.
5. Contact your city. Ask what pollutants and limits they allow, and whether you need an industrial wastewater discharge permit. Then compare your lab results to their limits before applying.

Treat It Yourself or Ship It Out?

If your wastewater is hazardous or exceeds the city’s limits, you have two main options:

• Off-site disposal. Collect it and send it to a permitted third-party treatment or disposal facility. This usually makes sense for low volumes, for example around 50 gallons a month.
• On-site treatment. Install a treatment system that brings the water within permit limits so it can be discharged. This usually makes sense for high volumes, hundreds or thousands of gallons a month.

Most companies that generate large volumes end up investing in on-site treatment. It cuts the cost of transporting and disposing of the water, and it can reduce the waste generation paperwork and compliance requirements that come with shipping it off-site.

When to Hire a Wastewater Permit Consultant in Texas

A simple discharge question can often be answered with a call to your city. It’s worth bringing in a wastewater permit consultant when:

• You’re not sure which of your wastewater streams are regulated
• Lab results show metals, solvents, oils or pH problems
• Your city has asked you to apply for an industrial user permit, or sent you a notice of violation
• You’re deciding between off-site disposal and an on-site treatment system
• You need help with ongoing sampling, reporting and recordkeeping after you’re permitted

We help Texas manufacturers identify regulated wastewater, work through the permit process with the city or TCEQ, and manage the ongoing requirements.

Texas Wastewater Discharge Permit FAQ

Do I need a permit to discharge industrial wastewater to the sewer in Texas?

Often, yes. Most Texas cities regulate industrial discharges to their sewer systems, and cities with approved pretreatment programs issue industrial user permits. Check with the city that owns your sewer system before discharging any process wastewater.

Who issues industrial wastewater discharge permits in Texas?

For discharges to the city sewer, usually the local city or utility. TCEQ may regulate some industrial users where the city doesn’t have an approved pretreatment program. Direct discharges to surface water require a TPDES permit from TCEQ.

Can I pour rinse water down the drain?

Not without checking first. Rinse and cleaning water from industrial processes is not domestic sewage, and it may contain contaminants your city restricts or federal rules prohibit.

What can’t be discharged to a city sewer?

Federal rules prohibit discharges that create fire or explosion hazards, are corrosive (pH below 5.0 unless the plant is designed for it), block sewer flow, release toxic gases, contain problem amounts of oil, or overheat the treatment plant. Your city may have stricter local limits.

What happens if I discharge without a permit?

Your city or TCEQ can take enforcement action, which may include fines and orders to stop discharging. You may also be on the hook for damage to the sewer system or treatment plant.

Do I need a permit for non-contact cooling water?

Often, yes. Non-contact cooling water doesn’t touch your product, but it’s still a non-domestic discharge and may contain treatment chemicals or heat. Many cities require approval before it goes to the sewer, and discharging it to a ditch or creek requires authorization from TCEQ.

Is a wastewater discharge permit the same as a storm water permit?

No. A wastewater discharge permit covers process wastewater sent to the sewer. Storm water permits cover rain runoff from your site and are handled by TCEQ.

This article provides general guidance on whether your plant may need a wastewater discharge permit. Once you decide to get one, there are many more requirements to manage, including sampling, reporting and recordkeeping.

Disclaimer: This article is for general informational purposes only and is not legal advice. Wastewater requirements vary by city and by facility. Contact your local utility or TCEQ, or consult a qualified professional about your specific situation.