An educational, cited reference for homeowners — not a claim that ClickSeptic services Colorado today. ClickSeptic has zero live markets anywhere yet.
Short answer: Colorado's Water Quality Control Commission, under the Colorado Department of Public Health and Environment (CDPHE), sets minimum statewide standards for on-site wastewater treatment systems (OWTS) in Regulation No. 43 (5 CCR 1002-43), authorized by the OWTS Act, C.R.S. Title 25, Article 10. For systems of 2,000 gallons per day or less, permitting, inspection, and enforcement are delegated entirely to county or district public health agencies, which may adopt rules at least as strict as the state minimum; larger systems fall additionally under state Regulation 22.
Last updated: September 2026. This page summarizes public Colorado regulatory information for homeowner reference and is not legal advice — always confirm current requirements directly with the state or local agency cited below. ClickSeptic has not launched in any market and has zero operators onboarded anywhere today; this page does not claim ClickSeptic provides service in Colorado or anywhere else.
Colorado's Water Quality Control Commission, under the Colorado Department of Public Health and Environment (CDPHE), sets minimum statewide standards for on-site wastewater treatment systems (OWTS) in Regulation No. 43 (5 CCR 1002-43), authorized by the OWTS Act, C.R.S. Title 25, Article 10. For systems of 2,000 gallons per day or less, permitting, inspection, and enforcement are delegated entirely to county or district public health agencies, which may adopt rules at least as strict as the state minimum; larger systems fall additionally under state Regulation 22.
Colorado has no single statewide statute mandating a septic inspection at every home sale. C.R.S. 25-10-106 lets local boards of health adopt their own OWTS permitting and inspection rules, and many counties use that authority to require a transfer-of-title inspection, use permit, or acceptance document before closing (e.g., Clear Creek County's Use Permit for systems over 5 years old); other counties impose no such requirement, so the obligation varies by county rather than by state law.
No Colorado statute or state regulation sets a fixed statewide pumping calendar. Regulation 43 (5 CCR 1002-43.14) makes the owner responsible for maintenance and lets local boards adopt their own maintenance/cleaning schedules; some counties codify a number (e.g., Arapahoe County's draft regulation requiring inspection every 4 years and pumping once sludge/scum exceeds 25% of tank volume), but this is local rule, not state law, and general advice of every 3-5 years remains guidance rather than a codified state rule.
OWTS permits for systems up to 2,000 gpd are issued by county or district public health agencies under their own OWTS regulations built on the state Regulation 43 floor; CDPHE/the Water Quality Control Commission handles state-level review only for larger systems or those needing Regulation 22 site approval.
Colorado's OWTS program is unusually decentralized even by delegated-state standards: the state regulation (Reg. 43) supplies only a floor, and each county board of health independently decides whether to require sale-time inspections, use permits, or additional stringency, producing a genuine county-by-county patchwork within one state.
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