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Working group urges code‑style approach to on‑site wastewater rules, proposes nitrogen thresholds and training requirements
Summary
A multi‑stakeholder sewage disposal working group recommended a package of 20 reforms including a codes‑and‑standards advisory model for technical rules, nitrogen‑sensitivity mapping, thresholds for when enhanced nitrogen removal is required, increased training and certification for local sanitarians and installers, data collection improvements, and homeowner financing for failing systems.
A multi‑stakeholder working group convened under 2025 legislation delivered detailed recommendations to the Public Health Committee calling for a systems change in how Connecticut regulates on‑site wastewater systems.
Co‑chairs John Guskowski (planning consultant), Jim Paris (Homebuilders & Remodelers Association) and local health director Sonia Brinkworth presented a package the group framed as an integrated set of reforms rather than independent changes. Core recommendations included:
• Create a permanent technical advisory body (modeled on the Department of Administrative Services codes & standards committee) to review and vote on technical standards and new technologies before agency rulemaking;
• Adopt a risk‑based nitrogen framework: systems under 7,500 gallons generally would not trigger nitrogen reviews unless located in mapped nitrogen‑sensitive areas; in sensitive areas the threshold would be 5,000 gallons or greater, with clear sensitivity maps tied to coastal and wetland designations;
• Improve training and certification: add field and soils morphology training and continuing education for local sanitarians and installers; establish a third 'AT' or advanced training pathway for proprietary alternate treatment systems;
• Strengthen data collection and a statewide repository for system and nitrogen monitoring information so agencies can make evidence‑based decisions;
• Enable work‑sharing agreements across local health districts to resolve capacity bottlenecks and a more predictable fee/scheduling system to reduce development uncertainty;
• Establish homeowner assistance financing for critical repairs and replacements of failing systems.
Working group leaders stressed that implementing nitrogen‑related technical requirements without the recommended process and transparency mechanisms would raise costs and uncertainty without delivering intended water quality gains. They recommended legislation (HB5514 §11) directing DPH and DEEP to evaluate and adopt the working group package and to fund necessary staffing and training.
Why it matters: On‑site wastewater systems serve roughly 40% of Connecticut residents. The recommendations aim to balance water quality protection (particularly nitrogen to coastal waters) with housing affordability and predictable permitting. Stakeholders urged phased implementation to avoid unintended development costs.
What’s next: Committee members asked for follow‑up data, maps of sensitivity zones, and cost‑benefit analysis. DPH indicated continued dialogue and that many technical items will require rulemaking and resourcing.
