Publications & Research

Soil Resources

Soil Observation Log

Soil Texture Chart

Profile Hole Criteria

Design Guidance

Regulation 43

• Evaluating sand gradations.
• Sand gradation graph.
• Design using chambers.
• Infiltrative surface.
• Replacement/added soils.
• Required Setback from OWTS to a Well or Cistern.
• Mound system guidance document.
• Mound system spreadsheet.
• Siphon Design
• Wastewater site application Policy 6.

CDPHE Mound Guidance

Siphon Sizing Worksheet provided by OSI, Inc.

CPOW Guidance Document for NDDS-Final Revised September, 2016

CPOW Guidance Document for NDDS October, 2024

CDPHE Website

Training Videos

Soil Hand Texturing

Colorado Soil Texturing

Colorado Test Pit Demonstration

NDDS Installation Video

OWTS Pressure Distribution

CPOW Logo

CPOW Logo for Member Use

Research

There are many institutions and organizations that are researching various areas of onsite wastewater treatment systems. Here are just a few:

• Colorado School of Mines
• Decentralized Water Resources Collaborative
• University of Tennessee
• University of Minnesota
• Water Environment Research Foundation
• Water Environment Federation