8 state overlays at launch. Federal baseline everywhere else.
A state overlay is the primacy-agency delta layered on top of the federal 40 CFR 141 Subpart O baseline — additional regulated contaminants, state-specific educational language, different distribution rules for non-bill-paying consumers, or tribal / language-access provisions. This page shows which states ship with a purpose-built overlay at launch and which run federal-only while we engage their primacy agency.
8 states with purpose-built overlays.
At product launch, overlays ship for CA, TX, NY, FL, IL, OH, PA, NC. Each overlay declares the federal paragraphs it modifies, the state-specific rule text, and the compliance-validator checks. Per our platform policy, a state overlay never ships without a user-confirmed authoritative source (state regulation section + URL).
California
Primacy agency: State Water Resources Control Board — Division of Drinking Water.
Visit primacy agency →Florida
Primacy agency: Florida Department of Environmental Protection.
Visit primacy agency →Illinois
Primacy agency: Illinois Environmental Protection Agency.
Visit primacy agency →New York
Primacy agency: New York State Department of Health.
Visit primacy agency →North Carolina
Primacy agency: North Carolina Department of Environmental Quality.
Visit primacy agency →Pennsylvania
Primacy agency: Pennsylvania Department of Environmental Protection.
Visit primacy agency →Texas
Primacy agency: Texas Commission on Environmental Quality.
Visit primacy agency →42 states running the federal baseline.
Every state runs the federal 40 CFR 141 Subpart O baseline — that is what makes a CCR legally compliant at the federal level. The states below do not yet have a 1water.ai overlay; utilities in these states can still publish a federally-compliant CCR through 1water.ai. If you operate in a state you want prioritized, let us know.
Every overlay ships with a named source.
Overlay rule text is never generated from memory. When we add a state, we work with the primacy agency or a licensed operator in that state to confirm (a) the authoritative section of the state code, (b) the public URL where it lives, and (c) any additional educational or distribution language that differs from the federal requirement. The overlay is then registered in our regulatory code with tests that match every check against the verbatim state rule.
If the state updates its rule, we re-fetch, diff, and publish the delta on our changelog. Customers publishing under an earlier version receive a notification.
Rules that a state overlay layers on top of.
Need an overlay for your state? Name the authoritative source.
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