Septic System Permits in Rhode Island: DEM Requirements
Yes, all new septic systems and major system components require a permit from the Rhode Island DEM. Whether you're installing a new system, replacing an existing one, or making significant modifications, Rhode Island law requires proper permitting through the Onsite Wastewater Treatment System (OWTS) program.
What Requires an OWTS Permit:
- New septic system installations
- Septic system replacements
- Major system component upgrades
- Pump station installations
- Advanced treatment systems
- System expansions or modifications
What Doesn't Require a DEM Permit:
- Minor repairs to building sewers (pipes between house and tank)
- Routine maintenance and pumping
- Simple pipe repairs that don't affect system capacity
Rhode Island DEM Septic Permit Process
Step 1: Soil Testing and Site Evaluation
Before applying for a permit, you need:
- Professional soil percolation tests
- Site evaluation by licensed professionals
- Groundwater assessment
- Distance verification from wells and property lines
Step 2: System Design
- Professional system design by licensed engineer or designer
- Plans must meet Rhode Island OWTS regulations
- Design specifications based on soil conditions and household size
- Compliance with local zoning requirements
Step 3: Permit Application Submission
DEM's Office of Water Resources has launched a new online system for OWTS/Septic permit applications, making the process more streamlined:
Required Documents:
- Completed OWTS permit application
- Professional system design plans
- Soil test results and site evaluation
- Plot plan showing system location
- Zoning compliance verification
Step 4: DEM Review Process
- Technical review by DEM staff
- Plan approval or revision requests
- Site inspection scheduling
- Final permit issuance
Septic Permit Costs in Rhode Island
The cost of obtaining RI septic permits typically ranges from $150 to $300, depending on the specifics of the project. Additional fees may apply for advanced systems.
Typical DEM Permit Fees:
- Standard OWTS Permit: $150-$300
- Advanced Treatment Systems: $300-$500
- Pump Station Permits: $200-$400
- Commercial Systems: $400-$800
- Amendment Fees: $75-$150
Additional Professional Costs:
- Soil testing: $500-$1,200
- System design: $1,500-$3,500
- Site evaluation: $300-$800
- Engineering review: $500-$1,500
Timeline for Rhode Island Septic Permits
Standard Permit Timeline:
- Application Review: 30-60 days
- Site Inspection: 1-2 weeks after approval
- Installation: 1-3 days (weather dependent)
- Final Inspection: Within 1 week of completion
- Total Timeline: 6-10 weeks on average
Factors That Affect Timeline:
- Complexity of system design
- Site conditions and accessibility
- Seasonal weather conditions
- DEM review backlog
- Need for system amendments or revisions
Rhode Island OWTS Requirements and Standards
Minimum Setback Requirements:
- Private wells: 100 feet minimum
- Public wells: 200 feet minimum
- Property lines: 10 feet minimum
- Buildings: 20 feet minimum
- Wetlands: 50 feet minimum (may require more)
- Surface water: 200 feet minimum
System Design Standards:
- Minimum 1,000-gallon tank capacity
- Proper sizing based on bedroom count
- Adequate soil absorption area
- Appropriate depth to groundwater
- Compliance with coastal regulations (if applicable)
Special Considerations for Coastal Areas
Within the coastal zone, the CRMC requires that any septic system within fifty feet of the shoreline be a zero-discharge system. Additional coastal requirements include:
- Enhanced treatment standards
- Nitrogen reduction requirements
- Storm-resistant design specifications
- Special inspection protocols
- Compliance with Coastal Resources Management Council (CRMC) regulations
Rhode Island Cesspool Replacement Requirements
All cesspools in Rhode Island are subject to the Rhode Island Cesspool Act of 2007 and will need to be replaced. Key requirements include:
Mandatory Replacement Triggers:
- Property sale or transfer
- System failure or malfunction
- Building additions that increase flow
- Proximity to drinking water sources
- Environmental contamination concerns
Replacement Timeline:
- Must be replaced when triggered by qualifying events
- System failure requires immediate action
- Property transfers allow 2 years for replacement
Licensed Professionals Required
Rhode Island requires licensed professionals for septic work:
Required Licenses:
- System Designers: Professional engineer or licensed designer
- Installers: Licensed OWTS installer
- Site Evaluators: Licensed soil evaluator
- Inspectors: Certified system inspector
Verification Requirements:
- All professionals must be currently licensed with DEM
- License verification available through DEM website
- Only licensed professionals can submit permit applications
Common Permit Application Issues
Top Reasons for Application Delays:
- Incomplete soil testing data
- Missing site evaluation reports
- Inadequate setback distances
- Incorrect system sizing calculations
- Missing zoning compliance verification
How to Avoid Delays:
- Work with experienced licensed professionals
- Complete all required testing before application
- Verify setback requirements early in planning
- Submit complete applications with all documentation
- Respond quickly to DEM revision requests
DEM Inspection Process
Pre-Installation Inspection:
- Site verification
- Soil condition confirmation
- Setback measurement verification
- Installation approval
Installation Inspection:
- System component verification
- Proper installation techniques
- Code compliance confirmation
- Final system approval
Post-Installation Requirements:
- System startup verification
- Maintenance plan submission
- Operating permit issuance
- Periodic inspection scheduling
Maintenance and Compliance
Ongoing Requirements:
- Regular pumping (every 3-5 years typically)
- Annual inspections for advanced systems
- Maintenance records retention
- Compliance with operating permits
Advanced System Requirements:
- Professional maintenance contracts
- Quarterly monitoring reports
- Annual compliance inspections
- Component replacement schedules
Local Variations Across Rhode Island
Different municipalities may have additional requirements:
Major Cities and Towns:
- Providence: Urban density considerations
- Warwick: Coastal protection requirements
- Cranston: Additional soil testing requirements
- Newport: Historic district considerations
- Westerly: Enhanced coastal standards
- South Kingstown: Rural system variations
Frequently Asked Questions
How long are OWTS permits valid?
OWTS permits are typically valid for 2 years from the date of issuance for installation.
Can I install my own septic system?
No, Rhode Island requires licensed installers for all septic system installations.
What happens if I install without a permit?
Installing without permits can result in fines, forced system removal, and legal complications.
Do I need permits for septic pumping?
No, routine pumping and maintenance do not require permits.
Can I upgrade my system without a new permit?
Major upgrades require new permits; minor repairs typically do not.
Emergency Situations
System Failures:
- Immediately contact DEM for emergency guidance
- Cease water use if directed
- Arrange for temporary waste management
- Schedule emergency repairs with licensed professionals
Health Department Notifications:
- Report sewage overflows immediately
- Coordinate with local health departments
- Document all emergency actions
- Follow prescribed remediation steps
Tips for Success
- Start Early: Begin the permit process well before installation needs
- Use Licensed Professionals: Work only with DEM-licensed contractors
- Understand Site Limitations: Evaluate site constraints before design
- Budget Appropriately: Include all permit, professional, and installation costs
- Plan for Maintenance: Establish ongoing maintenance protocols
Need help with your Rhode Island septic system project?
Rockhouse Construction has extensive experience with DEM septic permit applications and installations throughout Rhode Island. From initial site evaluation and permit applications to final system installation and inspection, we handle every aspect of your septic project with professionalism and expertise. Our team works with licensed OWTS professionals to ensure full compliance with all Rhode Island DEM requirements and regulations.
Contact us today for a consultation and let us guide you through the entire septic permitting and installation process.









