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Stormwater Directory

Rhode Island

Rhode Island Department of Environmental Management

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Quick Summary

For most Rhode Island projects disturbing 1 acre or more, you need a state NPDES Construction General Permit and a SWPPP, plus coordination with the local SESC program. Rain-triggered inspections are required after discharge events.

State-DelegatedVerified 2026-03

Construction Permit

Permit Document ↗
Permit Name
RIPDES General Permit for Stormwater Discharges from Construction Activity (RIR100000)
Threshold
≥ 1 acre of land disturbance, or < 1 acre if part of a larger common plan of development or sale that will ultimately disturb ≥ 1 acre
NOI Lead Time
A Notice of Intent (NOI) must be submitted to RIDEM and permit coverage confirmed before construction activities begin; RIDEM typically processes NOIs within 5–10 business days; permit becomes effective upon authorization acknowledgment
Application Method
Online via RIDEM's online permitting portal (RI RIPDES Online Reporting System); paper NOI submission is also accepted by mail to RIDEM's Office of Water Resources
Fee
$500 for sites disturbing < 5 acres; $1,000 for sites disturbing ≥ 5 acres; fee is a one-time payment at NOI submission
Permit Expires
September 26, 2026
Apply for Permit ↗

SWPPP Requirements

Permit Document ↗
SWPPP Required
Yes
PE Cert Required
No
Template Available
Yes
A Stormwater Pollution Prevention Plan (SWPPP) must be prepared and implemented before submitting the NOI. RIDEM provides a SWPPP template and Rhode Island Stormwater Design and Installation Standards Manual. The SWPPP must be signed and certified by the operator. No PE stamp is mandated by RIR100000 for the SWPPP itself, but Rhode Island separately requires an Erosion and Sediment Control Plan prepared by a licensed PE or Registered Landscape Architect for most significant construction projects under state building and development regulations. The SWPPP must be kept on site and made available to RIDEM and local authorities.

Inspection Requirements

Permit Document ↗
Frequency
Every 7 days and within 24 hours of a storm event that results in a discharge from the site. During extended dry periods when there is no discharge potential, inspection frequency may be reduced at the operator's discretion with adequate justification documented in the SWPPP.
Rain Trigger
Within 24 hours of any storm event that results in a discharge from the site (discharge-based trigger)
Inspector Qualification
No mandatory state-specific inspector certification under RIR100000; inspections must be performed by a 'qualified person' with appropriate training and knowledge of the SWPPP and BMP implementation. Rhode Island does not administer a state stormwater inspector certification program; CPESC (Certified Professional in Erosion and Sediment Control) or equivalent credentials are commonly used by practitioners. Inspection reports must document the inspector's name and qualifications.
Accepted Certifications
No state-specific mandatory cert; inspector must be a 'qualified person' with appropriate training; CPESC, CESSWI accepted

Discharge Standards

Permit Document ↗
Turbidity Limit
No numeric NTU effluent limit in RIR100000; discharges must not cause or contribute to violations of Rhode Island water quality standards (RI Code R46-12-OWQ)
Rhode Island water quality standards prohibit stormwater discharges that cause turbidity increases sufficient to impair the designated uses of receiving waters. Visual monitoring is required at each inspection event. Rhode Island's relatively small land area includes many sensitive coastal and freshwater resources, including Narragansett Bay watershed — projects in coastal areas or near salt marshes may face heightened scrutiny and additional conditions. RIDEM's Office of Water Resources coordinates with Coastal Resources Management Council (CRMC) for projects in the coastal zone, which may require separate CRMC assent.

Post-Construction

RIDEM ↗
Required
Yes
Post-construction stormwater management is required under Rhode Island's Phase II MS4 RIPDES permits for regulated MS4 communities. The RIR100000 general permit requires that permanent post-construction BMPs be installed and certified as functioning before the Notice of Termination (NOT) is filed. Rhode Island's 2010 Stormwater Design and Installation Standards Manual (updated 2022) governs post-construction control design. The state requires long-term operation and maintenance agreements for post-construction BMPs, typically recorded as a deed restriction or easement.

Impaired Waterbody / TMDL Requirements

Elevated Risk

Rhode Island RIDEM construction stormwater permits include provisions for discharges to impaired coastal and freshwater bodies, many of which are impaired for nutrients. Projects near 303(d)-listed waters may face additional conditions or require individual permit review. Rhode Island's small size and concentration of coastal resources mean that many construction projects are near sensitive receiving waters. Check RI's Water Quality Assessment and Integrated Report before permitting.

Program Contact

Contact Page ↗
Contact
Joseph Camara — Environmental Engineer II, Water Quality Certification & Stormwater Construction
Phone
(401) 537-4206
Email
joseph.camara@dem.ri.gov

State-Specific Notes

Rhode Island administers its own NPDES-equivalent program called RIPDES (Rhode Island Pollutant Discharge Elimination System) under state authority. As the smallest U.S. state by area, Rhode Island has a high proportion of land area within sensitive watersheds, particularly the Narragansett Bay watershed, making stormwater management a high-priority environmental issue. Projects requiring both a RIPDES construction permit and a CRMC assent must coordinate the two permit processes, which can add time to project timelines. Rhode Island's 2022 update to the Stormwater Design and Installation Standards Manual incorporated updated Low Impact Development (LID) requirements. The state's small size and dense development patterns mean many projects are in regulated MS4 areas with additional local stormwater ordinance requirements.

Disclaimer: This information is provided for general reference only and may not reflect the most current regulatory requirements. Always consult the RIDEM website and applicable regulations before beginning any construction activity.