Permit pages
MS4 software, framed for the permit your state agency issues.
State-specific permit pages with the same product framework. The data structures map to the six federal Minimum Control Measures. The framing on each page reflects how the state agency actually administers the Phase II program. Currently covering Pacific Northwest states, with more added as we engage them.
Currently covered
Phase II MS4 programs by state.
Each page covers the permit framework, how the product maps to the six MCMs in that state, what reporting looks like under the issuing agency, pricing, and an honest note on scope.
- Pacific Northwest
Washington Phase II
Western Washington Phase II MS4 General Permit
Issuing agency: Washington State Department of Ecology
Built around the Western Washington Phase II permit issued by Ecology. Module-by-MCM mapping, March 31 annual report cycle, and the strongest reference work to date.
Open page - Pacific Northwest
Oregon Phase II
Phase II MS4 General Permit
Issuing agency: Oregon Department of Environmental Quality
Aligned to the six MCMs that DEQ uses for Oregon's Phase II MS4 General Permit. Framework fits cleanly. Honest about where the deepest reference work is today.
Open page - Pacific Northwest
Idaho Phase II
IPDES Phase II MS4 General Permit
Issuing agency: Idaho Department of Environmental Quality
Aligned to the federal six-MCM framework that Idaho DEQ uses through the IPDES program. Same product, framed for Idaho permittees.
Open page
How the coverage grows
One state at a time, only when we can write it honestly.
We add a state page when we can frame it accurately and when the product framework fits. We are not going to ship thirty thin state pages just to chase keywords. Each page on this list reflects real attention to how the issuing agency administers the program, and every page includes an honest note on where our deepest reference work currently is.
Phase II MS4 programs across the country share a federal framework: the same six Minimum Control Measures, the same general structure of inspections, IDDE response, BMP tracking, and annual reporting. State-level differences are real but operate on top of that shared framework. When we engage a new state, what gets added is the state-specific framing, not a different product.
If your state is not on the list yet and you operate under a Phase II MS4 General Permit, the product framework still fits. The framing on this site just hasn't caught up to your state yet. Reach out and we'll talk through whether a pilot makes sense.
Don't see your state?
We can still serve Phase II programs outside the states listed above.
The product framework is built around the six federal MCMs that Phase II MS4 General Permits use across the country. If your city or county is a Phase II permittee under a different state agency, the workflows still translate. We just haven't published a state-specific framing page yet.
Related resources
Useful reading regardless of your state.
- Guide Understanding MS4 compliance: a plain-language overview
- Blog How to make an MS4 program audit-ready (without rewriting your spreadsheets)
- Blog Handling illicit discharges from complaint to closure: a working playbook for MS4 coordinators
- Platform The full platform: workflows, modules, roles, and how the pieces fit together