Rhode Island Pretreatment Standards regulations & environmental compliance analysis

Rhode Island Pretreatment Standards: What you need to know

Governing Law and Regulations

Pretreatment regulations: Rhode Island Rules and Regulations (RI Rule) 12.190.004

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On-site wastewater treatment systems (OWTSs): RI Rule 12.120.002

Designer licenses: RI Rule 12.120.002-9

Installer licenses: RI Rule 12.120.002-13

OWTS applications: RI Rule 12.120.002-17

Application content: RI Rule 12.120.002-18

Grease tanks: RI Rule 12.120.002-25

Uniform septage disposal fee: RI Rule 12.190.035-1 to 12.190.035-10

Narragansett Bay Commission (NBC): Rhode Island General Laws (RI Gen. Laws) 46-25-1 to 46-25-69

Regulatory Agencies

Rhode Island Department of Environmental Management (DEM) Bureau of Environmental Protection Office of Water Resources

Narragansett Bay Commission (NBC)

U.S. Environmental Protection Agency (EPA) Region 1

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Rhode Island has adopted the federal pretreatment standards by reference. See the national section PRETREATMENT STANDARDS, and contact DEM for more information. Specific prohibitions or limits on pollutants that are more stringent than the national standards may be developed by a publicly owned treatment works.

In the event of any conflict with federal regulations, the more strict standard applies. Any additions or amendments to future federal regulations are automatically incorporated by reference. The requirements are necessary to help maintain the state's federally approved Rhode Island Pollutant Discharge Elimination System (RIPDES) and pretreatment programs.

Rhode Island has established requirements for the design and operation of OWTSs, including licensing requirements for designers and installers, ...


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