--- title: California Stormwater Defense description: The California Stormwater Defense blog provides practical, plain-language insights to help operators, developers, property owners, consultants, and in-house counsel better understand California's complex stormwater regulatory landscape. --- [![Allen Matkins](https://www.castormwater.com/hubfs/AM-Blue-Logo.png)](https://www.allenmatkins.com/) # California Stormwater Defense The California Stormwater Defense blog provides practical, plain-language insights to help operators, developers, property owners, consultants, and in-house counsel better understand California's complex stormwater regulatory landscape. [![](https://www.castormwater.com/hubfs/20260901%20Supreme%20Court%20Surrounded%20with%20Water.png)](https://www.castormwater.com/citizen-suits-at-a-constitutional-crossroads) Featured Article ## [Citizen Suits at a Constitutional Crossroads](https://www.castormwater.com/citizen-suits-at-a-constitutional-crossroads) If you have ever received a 60-Day Notice under the Clean Water Act (CWA), you know the drill. A private plaintiff sends the letter. The government rarely steps in. The plaintiff files suit, seeks civil penalties and... [Read More](https://www.castormwater.com/citizen-suits-at-a-constitutional-crossroads) ## Latest Articles [![](https://www.castormwater.com/hubfs/sunset-nature-waters-dusk-preview.jpg)](https://www.castormwater.com/el-niño-is-coming-what-california-industrial-facilities-need-to-know-about-stormwater-compliance) ### [El Niño Is Coming: What California Industrial Facilities Need to Know About Stormwater Compliance](https://www.castormwater.com/el-niño-is-coming-what-california-industrial-facilities-need-to-know-about-stormwater-compliance) In the middle of a dry California summer, stormwater runoff feels like the furthest thing from anyone’s mind. Yet for industrial... [Read More](https://www.castormwater.com/el-niño-is-coming-what-california-industrial-facilities-need-to-know-about-stormwater-compliance) [![](https://www.castormwater.com/hubfs/pexels-tom-de-decker-463640997-24243609-2.jpg)](https://www.castormwater.com/a-cottage-industry-the-economics-of-cwa-citizen-suit-enforcement) ### [“A Cottage Industry”: The Economics of CWA Citizen Suit Enforcement](https://www.castormwater.com/a-cottage-industry-the-economics-of-cwa-citizen-suit-enforcement) Citizen suits under the Clean Water Act were designed to supplement government enforcement, allowing private parties to step in... [Read More](https://www.castormwater.com/a-cottage-industry-the-economics-of-cwa-citizen-suit-enforcement) [![](https://www.castormwater.com/hubfs/pexels-quy-hoang-251118521-38258555-2.jpg)](https://www.castormwater.com/the-environmental-plaintiffs-a-guide-to-the-organizations-filing-stormwater-citizen-suits-in-california) ### [The Environmental Plaintiffs: A Guide to the Organizations Filing Stormwater Citizen Suits in California](https://www.castormwater.com/the-environmental-plaintiffs-a-guide-to-the-organizations-filing-stormwater-citizen-suits-in-california) If you operate an industrial facility in California, it helps to know who might be on the other side of a 60-Day Notice.... [Read More](https://www.castormwater.com/the-environmental-plaintiffs-a-guide-to-the-organizations-filing-stormwater-citizen-suits-in-california) [![](https://www.castormwater.com/hubfs/pexels-quy-hoang-251118521-38258555-1.jpg)](https://www.castormwater.com/strict-liability-under-the-cwa-what-it-means-for-industrial-stormwater-dischargers-1) ### [Strict Liability Under the CWA: What It Means for Industrial Stormwater Dischargers](https://www.castormwater.com/strict-liability-under-the-cwa-what-it-means-for-industrial-stormwater-dischargers-1) If you are an industrial facility operator in California, there is a legal reality about the Clean Water Act that catches many... [Read More](https://www.castormwater.com/strict-liability-under-the-cwa-what-it-means-for-industrial-stormwater-dischargers-1) [![](https://www.castormwater.com/hubfs/pexels-tom-de-decker-463640997-24243609.jpg)](https://www.castormwater.com/the-60-day-notice-what-it-is-what-it-means-and-what-to-do-when-you-get-one) ### [The 60-Day Notice: What It Is, What It Means, and What to Do When You Get One](https://www.castormwater.com/the-60-day-notice-what-it-is-what-it-means-and-what-to-do-when-you-get-one) If you operate an industrial facility in California, there is a letter you never want to receive but increasingly might. It is... [Read More](https://www.castormwater.com/the-60-day-notice-what-it-is-what-it-means-and-what-to-do-when-you-get-one) [![](https://www.castormwater.com/hubfs/pexels-tom-de-decker-463640997-24243609-1.jpg)](https://www.castormwater.com/did-ccsf-actually-change-anything-why-citizen-suit-plaintiffs-appear-to-be-enforcing-receiving-water-violations-as-if-the-supreme-c-1782843832242) ### [Did CCSF Actually Change Anything? Why citizen-suit plaintiffs appear to be enforcing receiving water violations as if the Supreme Court never ruled, and what comes next.](https://www.castormwater.com/did-ccsf-actually-change-anything-why-citizen-suit-plaintiffs-appear-to-be-enforcing-receiving-water-violations-as-if-the-supreme-c-1782843832242) In March 2025, the Supreme Court handed industrial dischargers what looked like a landmark victory. In City and County of San... [Read More](https://www.castormwater.com/did-ccsf-actually-change-anything-why-citizen-suit-plaintiffs-appear-to-be-enforcing-receiving-water-violations-as-if-the-supreme-c-1782843832242) Allen Matkins Leck Gamble Mallory & Natsis LLP. All Rights Reserved ![](https://px.ads.linkedin.com/collect/?pid=715836&fmt=gif)