Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems


250-RICR-150-10-6 ACTIVE RULE

My Page Title

6.1Purpose

6.2Authority

6.3Liberal Application

6.4Severability

6.5Applicability

6.6Administrative Findings

6.7Incorporated Materials

6.8Definitions

6.9Prohibitions

6.10Class I, II, III, and IV Licenses

6.11Obtaining a Class I, II, III or IV License

6.12Expiration and Renewal of a Class I, II, III or IV License

6.13Disciplinary Action for Class I, II, III and IV Licensees

6.14Installer's License

6.15Onsite Wastewater Treatment Systems – General

6.16Soil Evaluation

6.17Additional Site Testing

6.18OWTS Applications

6.19Required Content of OWTS Submissions

6.20Applications Involving the DEM Freshwater Wetlands Program and the Coastal Resources Management Council

6.21Subdivisions

6.22Wastewater Flow

6.23Minimum Setback Distances

6.24Subsurface Drains

6.25Building Sewers

6.26Grease Tanks

6.27Septic Tanks

6.28Septic Tank Effluent Pipe

6.29Holding Tanks

6.30Pump Tanks

6.31Pumps

6.32Distribution Boxes

6.33Leachfields

6.34Dispersal Trenches

6.35Concrete Chambers

6.36Pressurized Drainfields

6.37Advanced Pressure Drainfields (APDs)

6.38Low Pressure Pipe (LPP)

6.39Large OWTS Requirements

6.40Alternative Toilets

6.41Alternative or Experimental Technology Approval

6.42Critical Resource Areas – General

6.43Requirements in the Salt Pond and Narrow River Critical Resource Areas

6.44Requirements in Drinking Water Supply Watershed Critical Resource Areas

6.45Nitrogen Loading in Areas of Onsite Drinking Water Wells

6.46Permit Expiration

6.47OWTS Installation

6.48Certificate of Construction

6.49Certificate of Conformance

6.50Permit Suspensions and Revocations

6.51Variance Requests

6.52Variance Review Process

6.53Appeals

6.54Fees

6.55Operation and Maintenance

6.56Removal and Abandonment

6.57Cesspool Phase Out

6.58Guidance Documents


#x200e6.59Figure 1: Leachfield Over Restrictive Layer or Bedrock

6.60Figure 2: Minimum Setback Distances in Drinking Water Supply Watershed Critical Resource Areas

6.61Figure 3: Minimum Setback Distances in the Salt Pond and Narrow River Critical Resource Areas

6.62Figure 4: Grease Tanks

6.63Figure 5: Septic Tanks

6.64Figure 6: Septic Tank Riser Detail

6.65Figure 7: Leachfield Construction, Invert of Distribution Lines Below Original Grade

6.66Figure 8: Leachfield Construction, Invert of Distribution Lines Above Original Grade

6.67Figure 9: Leachfield Construction on Sloping Sites

6.68Figure 10: Shallow Concrete Chambers

6.69Figure 11: Category 1 Technology and Pressurized Drainfield Schematic

6.70Figure 12: Category 2 Technology and Pressurized Drainfield Schematic

6.71Figure 13: Demand Dosing Tank with Centrifugal Pump

6.72Figure 14: Demand Dosing Tank with Multi-stage Centrifugal Pump

6.73Figure 15: Timed-dosing Tank with Centrifugal Pump and In-line Screen

6.74Figure 16: Timed-dosing Tank with Centrifugal Pump and Basket Screen

6.75Figure 17: Timed-dosing Tank with Screened Vault and Multi-stage Centrifugal Pump

6.76Figure 18: Above-ground Bottomless Sand Filter (Side View)

6.77Figure 19: In-ground Bottomless Sand Filter (Side View)

6.78Figure 20: Typical Bottomless Sand Filter (Top View)

6.79Figure 21: Side View Detail – Typical Bottomless Sand Filter

6.80Figure 22: Orifice Shield Detail: Note: Shields Shall Be Able to Drain. Details Vary from Manufacturer.

6.81Figure 23: BSF Flushing Valve Choice Detail

6.82Figure 24: PSND Cross Section Details

6.83Figure 25: PSND Cross Section Detail (Long Side)

6.84Figure 26: LPP Details for Regular Trenches (Top and Isometric Views)

6.85Figure 27: LPP Details for Shallow Concrete Chambers (Top and Isometric Views)


6.86Figure 28: South Shore Salt Ponds Critical Resource Area


#x200e6.87Figure 29: Narrow River Critical Resource Area

6.88Figure 30: Providence Water Supply Board Drinking Water Supply Watershed

6.89Figure 31: Cumberland, Pawtucket Water Supply Board and Woonsocket Drinking Water Supply Watersheds

6.90Figure 32: Newport, New Shoreham and Stone Bridge Fire District Drinking Water Supply Watersheds

6.91Figure 33: Eleanor Slater/Zambarano Unit, Bristol County Water Authority, Yawgoog Scout Reservation, and Jamestown Drinking Water Supply Watersheds


Title 250 Department of Environmental Management
Chapter 150 Water Resources
Subchapter 10 Wastewater & Storm Water
Part 6 Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems
Type of Filing Periodic Refile
Regulation Status Active
Effective 01/04/2022

Regulation Authority:

R.I. Gen. Laws Chapter 42-17.1 Environmental Management; Chapter 5-56 Installers of Individual Sewage Disposal Systems; Chapter 5-56.1 Designers of Individual Sewage Disposal Systems; Chapter 23-19.5 Percolation Tests and Water Table Elevations; Chapter 23-24.3 Substances or Compounds Used as Sewerage System Cleaners; Chapter 46-13.2 Drilling of Drinking Water Wells
and Chapter 23-19.15 Rhode Island Cesspool Act of 2007

Purpose and Reason:

This technical revision is being filed to correct a formatting error in the Notes section of the table at § 6.23(B) of this Part (Minimum Setback Distances - General). In the process of filing the final version of the amendment effective 11/25/2018, the following errors accidentally occurred: (1) The note labeled "(1)" was incorrectly split into two separate notes; and the language previously promulgated as the note labeled "(2)" was accidentally omitted. In this filing, the note (1) in the table at § 6.23(B) of this Part correctly reads: "(1) The distance between the building sewer or septic tank effluent pipe and a water supply line may be reduced and the lines may cross provided that either the building sewer or septic tank effluent pipe or water supply line is sleeved whenever the lines are within ten (10) feet of each other. The sleeve shall be seamless or schedule 40 PVC or equivalent with watertight joints and it shall have a watertight seal that is fastened to the pipes with a stainless steel retractable clamp. Whenever possible, the building sewer and septic tank effluent pipe should be laid below water supply lines at crossings. Pressurized building sewers or pressurized septic tank effluent pipes shall be laid below water supply lines at crossings. If the setbacks to a water supply line for a public water system cannot be met, the applicant must obtain, and submit to the Department, written permission from the water supplier." The note (2) in this table has been restored as follows: "(2)  Not applicable to building sewer and septic tank effluent pipe.  Setback distance of 10’ applies for all OWTS components not specifically listed." No substantive changes have been made as part of this technical revision.