Rhode Island Statewide Rule

Rhode Island Stormwater Management Statewide Permitting Standards

Heavy RestrictionsApplies statewide across Rhode Island (2026)

Rhode Island regulates stormwater under RIGL Chapter 46-12 and the RIPDES program administered by DEM, applying uniform statewide design and permitting standards that municipalities must implement at minimum.

Key Facts

Statute: RIGL Chapter 46-12
Program: RIPDES
Authority: RI DEM
Local Floor: State manual standards

Source: Rhode Island General Assembly

Full Breakdown

RIGL Chapter 46-12 (Water Pollution Act) authorizes DEM to operate the Rhode Island Pollutant Discharge Elimination System (RIPDES), which permits stormwater discharges from construction sites, industrial facilities, and Phase II MS4 communities. The RI Stormwater Design and Installation Standards Manual sets technical standards that local stormwater bylaws must meet or exceed. Coastal stormwater within CRMC jurisdiction is also subject to RIGL 46-23. Municipalities cannot adopt rules less stringent than RIPDES general permits.

Violations & Penalties

Unpermitted discharges or non-compliant construction site stormwater can trigger DEM enforcement orders, civil penalties up to $25,000 per day under RIGL 46-12-13, and stop-work orders.

Frequently Asked Questions

Do I need a state stormwater permit for home construction in Rhode Island?

Construction disturbing one or more acres requires a RIPDES Construction General Permit through DEM; smaller sites are governed by local ordinances that must implement the state standards.

Can a Rhode Island town adopt weaker stormwater rules than DEM?

No. Local stormwater ordinances must meet or exceed the RI Stormwater Design and Installation Standards Manual and RIPDES MS4 requirements; weaker standards are preempted by RIGL 46-12.

Sources

RIGL Chapter 46-12

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