Clean water: On-site wastewater treatment systems

On-site wastewater treatment systems (OWTS), also known as septic systems, are governed by Regulation 43.

How does this affect you?

  • For on-site wastewater treatment systems with flows 2,000 gallons per day or less, permitting is conducted by local counties.
  • We must provide initial review and acceptance of products and technology.
  • On-site wastewater treatment systems with flows greater than 2,000 gallons per day must follow the design review facility approval process.

Local agency OWTS program information.

Regulation 43:product acceptance lists

Product review submittal forms

Forms for local public health agencies

Regulation 43 policies and clarifications

Additional documents

Related OWTS links

Contact us

Systems less than or equal to 2,000 gallons per day
Chuck Cousino
Systems greater than 2,000 gallons per day
David Kurz