Enforcement Response Plans: How Texas POTWs Escalate Pretreatment Violations

A Texas POTW escalates a pretreatment violation by following its enforcement response plan, the written playbook federal rules require of every city that runs an approved pretreatment program. The plan matches each type of violation to a response, from a phone call or warning letter up to administrative orders, fines and termination of service. Two things push a facility up that ladder: violations that repeat, and a response that does not fix the cause.

What is an enforcement response plan?

It is the part of a POTW's approved pretreatment program, usually called the ERP, that says how the city investigates industrial user violations and how it responds to each kind.

The requirement is in 40 CFR §403.8, the federal pretreatment program rule. Paragraph (f)(5) says the plan must describe how the POTW investigates noncompliance, the escalating responses it will take for each type of violation and how fast, and the official, by title, responsible for each response. Texas adopts Part 403 by reference in 30 TAC §305.542, Pretreatment Standards, effective April 21, 2022.

The point is consistency: similar violations get similar responses, whoever handles the file. Ask your coordinator what the plan calls for at each step.

Who enforces pretreatment rules at a Texas facility?

Your city or utility, if it runs an approved pretreatment program. TCEQ, if it does not.

Under the 2020 memorandum of agreement between TCEQ and EPA Region 6, TCEQ approves POTW pretreatment programs and acts as the control authority for industrial users of POTWs without one. TCEQ can require a program at a POTW over 5 MGD that receives industrial pollutants able to cause pass through or interference, and at a smaller plant when conditions warrant. See when a Texas city runs its own pretreatment program versus deferring to TCEQ.

Which violations start enforcement?

Any violation of a pretreatment standard or requirement can. Limit exceedances are the obvious ones, but a late report is a violation too.

• Exceeding local limits, categorical standards or your permit limits.
• Prohibited discharges under 40 CFR §403.5, the national prohibited discharge standards, such as pass through, interference, or pH below 5.0 unless the plant is designed for it.
• Late, incomplete or improperly certified reports.
• Failing to report a violation, a slug discharge or a change in your discharge.
• Bypassing pretreatment equipment, or refusing access for inspection.

Your own reporting is part of the response. Under 40 CFR §403.12, the pretreatment reporting rule, if your sampling shows a violation you must notify the control authority within 24 hours of becoming aware of it, then resample and submit the results within 30 days, unless the control authority samples you at least monthly or sampled in between. An unanticipated bypass that exceeds a standard needs oral notice within 24 hours and a written report within five days under 40 CFR §403.17, the bypass rule.

How does enforcement escalate under an ERP?

Usually one step at a time, more formal each time a violation repeats or a deadline passes. Serious violations can skip steps.

EPA Region 8's model enforcement response plan (1998, an archived template) lists the usual tools, roughly from least to most formal:

1. Verbal notice or warning letter, for minor or isolated violations.
2. Notice of violation (NOV), which requires a written response on the cause and corrective actions.
3. Informal meeting or show cause hearing.
4. Administrative order, with deadlines, and possibly a compliance schedule, penalties or termination of service.
5. Fines, civil litigation or criminal referral.
6. Termination of service.

The model's clocks: violations documented within five days of receiving the data, a first response within 15 days, follow-up within 60 days, and formal action within 30 days of identifying significant noncompliance. Recurring violations escalate, and the response weighs your good faith, compliance history and whether earlier actions worked. Your city's plan sets its own terms.

Do not count on a warning first. EPA's Model Pretreatment Ordinance (2007) lets the city act without an NOV, take more than one action, and suspend a discharge after informal notice when it reasonably appears to endanger the health or welfare of persons. Its compliance orders can add self-monitoring.

When does a violation become significant noncompliance?

When a significant industrial user's violation meets one of the significant noncompliance (SNC) tests in §403.8(f)(2)(viii). Two are simple math on your results over six months.

• Chronic: 66% or more of the measurements for one pollutant exceed the limit, by any amount.
• Technical review criteria (TRC): 33% or more equal or exceed the limit times 1.4 for BOD, TSS, and fats, oil and grease, or times 1.2 for other pollutants except pH.
• Interference, pass through, imminent endangerment, or another violation the POTW finds harms its program. These reach any industrial user.
• A compliance schedule milestone missed by more than 90 days, or a report more than 45 days late.
• Failing to accurately report noncompliance.

Run the numbers. With six monthly samples, four over the limit is 67%: chronic. Two results at 1.2 times a metals limit is 33%: TRC, even if the other four are clean.

SNC costs you twice. The POTW must publish a newspaper notice, at least yearly, of users in SNC during the previous 12 months. And in the Region 8 model, an administrative order is the minimum response.

What response stops the escalation?

A written response that finds the real cause, fixes it and proves the fix with data. The model ordinance asks for an explanation of the violation and a plan with specific actions to correct and prevent it.

That plan does not erase the violation, but it speaks to the factors the model plan weighs: good faith and whether earlier actions worked. Work it like an engineering problem:

• Find the root cause first. A second violation after a promised fix reads worse than the first.
• Resample promptly, at the permitted point, with the required methods.
• Inspect the system. Did it fail, did loads outgrow it, or did something upstream change? If loads outgrew it, start with sizing pretreatment equipment for tighter local limits.
• Check calibration records for pH probes and flow meters.
• Fix procedures when the cause is human: training, written procedures, less manual adjustment.
• After a slug discharge, update your slug discharge control plan.
• Document what happened, why and what changed. Keep monitoring records at least three years, as §403.12 requires.

Two cautions. A bypass is prohibited unless it was unavoidable to prevent loss of life, injury or severe property damage, there was no feasible alternative, and you gave notice; backup equipment you should reasonably have installed for normal downtime or maintenance defeats the second test. And Texas left the federal upset provision, 40 CFR §403.16, out of §305.542, so do not plan around an upset defense without your attorney.

Is your facility ready to answer a notice of violation?

Yes, if you can answer yes to every item below from records you already have. Any no is the first thing to fix.

1. You know who your control authority and pretreatment coordinator are.
2. You have a written procedure for the 24-hour notice and the 30-day resample.
3. You check each pollutant against the chronic and TRC tests every six months.
4. Calibration and maintenance records are current.
5. Your last corrective action has data showing it worked.

Then ask your engineer: Is the system sized for today's loads? What change removes the cause?

A note on limits: this is general education on the federal pretreatment rules as Texas adopts them, and on EPA model documents, as checked in October 2026. Your permit, your city's ordinance and its ERP control, and they vary. It is not legal advice; bring in counsel for an order, a penalty or a termination notice.

Frequently asked questions

Is an NOV always the first step in pretreatment enforcement?

No. EPA's model plan starts with a phone call or warning letter for a minor violation, and EPA's model ordinance lets the city act without an NOV, including emergency suspension.

Does one exceedance put my facility in significant noncompliance?

For a significant industrial user, it depends on how often you sample. With six samples in six months, one exceedance is 17%. With two, one result at 1.2 times a metals limit is 50%, which meets the TRC test.

I manage compliance at a metal finishing shop in Texas, and our own sample came back over our nickel limit. What do we owe the city in the next 30 days?

Notify the control authority within 24 hours of learning the result. Resample and submit the results within 30 days unless the city's own sampling covers it. If an NOV follows, answer by its deadline with the cause and specific corrective actions.

I'm the plant manager at a Texas food plant that discharges to a small city's sewer, and the city has no pretreatment program. Who enforces our discharge limits?

TCEQ acts as the control authority for industrial users of a POTW without an approved program, under its agreement with EPA. The national prohibitions in §403.5 apply to every industrial user.

Related resources

• Texas Wastewater Pretreatment Permits: What Industrial Facilities Discharging to a POTW Must Know
• Self-Monitoring and Reporting Requirements for Texas Significant Industrial Users
• Significant Industrial User Designation: How a Texas Facility Gets Classified and What Changes
• Self Reporting Violations and TCEQ Enforcement Discretion: How Voluntary Disclosure Changes the Outcome of a Permit Exceedance

Facing a notice of violation from your POTW?

MES works the engineering side: what failed, what the records show, and what change to the pretreatment system or its operation keeps it from coming back. Your attorney handles the legal side.

We specialize in pretreatment system evaluation and redesign, root cause analysis after a violation, corrective action plans for compliance schedules, monitoring and calibration review, and wastewater engineering.

Modern Engineering Solutions, McKinney, Texas. Call (214) 833-6748 or contact our team.