Most facilities expect stormwater enforcement to come from a regulator. A letter from the Regional Water Quality Control Board, or a knock from your local CUPA, or Certified Unified Program Agency (which may be a county environmental health department, fire department, or another local agency depending on jurisdiction). So when an envelope arrives from a private law firm or an environmental group, threatening to sue your facility under the Clean Water Act, it catches people off guard.
This is citizen-suit enforcement. It is legal, it is common in California, and it is not the same thing as a government inspection. If you have received a notice, or you handle stormwater compliance and want to understand the risk, here is what these notices are and what actually protects you.
What a Citizen Suit Is
The Clean Water Act lets private parties enforce the law directly. Under Section 505 of the Act (33 U.S.C. § 1365), any person or group that is or may be affected by a violation can sue a facility for failing to comply with its permit. They do not need a government agency to act first. They can go to federal court on their own.
For California industrial facilities, the permit in question is the Industrial General Permit (IGP), the statewide stormwater permit that covers most manufacturers, recyclers, warehouses, and similar operations. When a facility’s sampling results, reports, or records show permit problems, that becomes the basis for a suit.
The remedies a plaintiff can seek include a court order to fix the problem, civil penalties paid to the federal treasury, and reimbursement of their attorney fees and costs. That last item matters. The attorney-fee provision is part of why an active group of private firms and nonprofit organizations pursue these cases in California, particularly in Southern California and the Bay Area and Central Valley.
Why California Facilities Are Targeted
Citizen-suit plaintiffs do not need to inspect your site to build a case. Almost everything they need is already public.
When you sample your stormwater and report results, that data goes into SMARTS, the State Water Board’s online stormwater reporting portal. SMARTS records are publicly accessible. A plaintiff can pull a facility’s sampling history, see where results exceeded benchmark levels, check whether annual reports were filed on time, and identify gaps without ever leaving their desk. The State Water Board itself maintains a public page acknowledging that citizen suits are a recognized enforcement tool under the Act.
That changes how you should think about your records. Your SMARTS history is not just a compliance formality. It is the evidence a plaintiff reads first.
Agency Enforcement vs. a Citizen Suit
These two things look similar and are often confused. They are not the same, and the difference affects how you respond.
| Agency Enforcement (NOV) | Citizen Suit | |
|---|---|---|
| Who initiates | Regional Water Board or other agency | Private group, law firm, or individual |
| What you receive | Notice of Violation, inspection finding, or order | A 60-day notice of intent to sue, by certified mail |
| Where it goes | Administrative process with the agency | Federal court |
| What they want | Correction, and sometimes penalties | Court order, civil penalties, and their attorney fees |
| Your defense rests on | Showing compliance and correcting findings | Documented permit compliance and a clean record |
A Notice of Violation from an agency starts a conversation with a regulator who can use discretion. A citizen suit starts a clock toward litigation. Both deserve a serious response, but the citizen suit is the one where your paper trail does most of the work.
The 60-Day Notice Period
The law requires a plaintiff to warn you before filing. Under the Clean Water Act, no plaintiff can file a citizen suit until they have given written notice of the alleged violations and waited 60 days. That notice goes to your facility, to the U.S. EPA, and to the State.
The notice arrives by certified mail. It identifies the alleged violations, the dates, the permit standard involved, and the people behind the claim. The 60-day window exists for a reason: it is the period during which a facility can correct problems and resolve the matter before it becomes a lawsuit.
Here is how the process typically unfolds.
| Stage | What Happens |
|---|---|
| 1. Notice received | A 60-day notice of intent to sue arrives by certified mail, listing alleged permit violations. |
| 2. 60-day period | The clock runs. The facility reviews its records, corrects deficiencies, and can open discussion toward resolution. |
| 3. Filing | If the parties do not resolve the matter, the plaintiff may file in federal court after day 60. |
| 4. Resolution | Most cases settle. Settlements commonly require compliance improvements, a payment, and the plaintiff’s fees. |
The single most important thing to understand: the 60 days is not a formality to wait out. It is your window to act. What you do with it depends almost entirely on the records you already have.
Did your facility receive a 60-day notice of intent to sue? Call (925) 551-7300 or request a consultation. We will review your SMARTS history and SWPPP with you and help you understand where you actually stand before the clock runs out.
Your Records Are Your Defense
A citizen suit is, at its core, an argument about whether your facility followed its permit. The way you win that argument is with documentation.
When a facility forwards us a notice, the first thing we ask for is the SMARTS upload history and the lab reports from recent sampling events. We are checking whether the samples were collected and reported on schedule, whether exceedances were addressed the way the permit requires, and whether the SWPPP on file reflects what the facility actually does. A facility that sampled on time, reported on time, responded to exceedances with the required evaluations, and kept its plan current is in a very different position than one with gaps in its record.
This is why the unglamorous work matters. A current Stormwater Pollution Prevention Plan, complete sampling records, on-time annual reports, and documented responses to any exceedances are not just permit requirements. They are the defense. The most common problem we see is not a facility that polluted. It is a facility that did the work but cannot prove it, because the records were never organized or the reporting fell behind.
If your sampling results have come back high, the response you file matters as much as the result itself. Our guide on stormwater exceedance response and ERA Level 1 and Level 2 evaluations walks through what the permit requires after an exceedance, and why those documented evaluations become part of your compliance record.
How CDMS Helps
CDMS does not litigate. Citizen suits are handled by attorneys, and a facility facing one needs legal counsel. What we do is the part that determines how strong your position is when counsel sits down to evaluate it: building and maintaining the compliance record.
That means making sure your SWPPP is current and accurate, your sampling happens on the right schedule with results reported to SMARTS on time, your annual reports are filed, and any exceedance triggers the evaluations and plan updates the IGP requires. We have handled stormwater compliance for California facilities since 1988, and we work alongside your legal counsel when a notice arrives, providing the documentation and technical context they need. For the full picture of how stormwater compliance works in California, see our SWPPP and stormwater compliance services guide.
The facilities that weather these notices best are the ones that had their records in order before the envelope arrived. The right time to build a defensible compliance record is well before anyone asks to see it.
Want to know whether your stormwater records would hold up under scrutiny? Call (925) 551-7300 or request a consultation. We will review your SWPPP, sampling history, and SMARTS reporting and tell you plainly where the gaps are and how to close them.
