Regulation and Application Forms for Onsite Wastewater Treatment Systems (OWTS)

Regulations

Onsite wastewater regulation is done at the local level. Boulder County Public Health (BCPH) regulations govern all onsite wastewater treatment systems (OWTS) in Boulder County. These regulations incorporate the guidelines established by the Colorado Department of Public Health and Environment (CDPHE); however, they are more stringent in some areas.

• Boulder County Regulations
• 2026 Boulder County OWTS Regulations
• Boulder County Clarification and Policy Documents
  • “No Closer Than” Allowance to Setbacks Requirements
  • Squirt Test Requirements
  • Siphon for Pressure Dosing Requirements
  • Onsite Wastewater Treatment System Sizing for Accessory Dwelling Units
  • Change in Use Policy
  • Definition of a Bedroom
• Colorado Regulations
• CDPHE Regulation Clarification
• OWTS Act
• Colorado Revised Statutes

Application Forms

• Permit Application and Procedures
• Property Transfer Instructions and Inspection Report
• OWTS Affidavit
• Agreement for Commercial or Non-Single Family
• Agreement to Convey Easement
• Agreement to Convey Easement for Property Line Setbacks
• Easement Maintenance Agreement
• Property Line Easement
• Record Drawing of Final OWTS Installation
• Repair Agreement Form
• Repair Agreement for Central Sewer
• Variance Procedure
• Variance Application

Please Note: This information is intended to provide a better understanding of the functions of onsite wastewater treatment and the need for proper design, installation, and maintenance. Always consult a licensed professional or public health official with questions regarding engineering, installation, and servicing of onsite wastewater systems.