Water Quality Standards Classifications

NEW!!! Conrad Use Attainability Analysis (UAA)

Ecological Data Application System (EDAS) Database
Download Zip File Here

The Montana Macroinvertebrate Indicators Report

Water Quality Act Overview
DEQ Staff Contacts
- Randy Apfelbeck (406) 444-2709
- Bob Bukantis (406) 444-5320
- David Feldman, (406) 444-6764
- Mike Suplee, (406) 444-0831
- Andy Welch, (406) 444-9897
EPA Water Quality Standards
Surface and Groundwater Quality Standards and Classifications
- Statute: Montana Water Quality Act
  - 75-5-301, 302, MCA
- Rules:
  - ARM 17.30.601 through 641 – Surface Water
  - ARM 17.30.1001 through 1045 – Groundwater
- Current Circular DEQ-7, Montana Numberic Water Quality Standards February 2008 - DEQ-7 contains the surface water aquatic life and human health water quality standards and the ground water human health standards. DEQ-7 is revised on an "as need" basis. DEQ-7 dated February 2008 is the most recent version. All previous versions are not in effect. If you have any questions about this document, contact Bob Bukantis, 444-5320. (Note: The document prints best using the legal landscape setting.)
- The spawning time and early life stages of Montana fishes (relevant to DEQ-7 ammonia and dissolved oxygen standards). Prepared by the Montana Department of Fish, Wildlife and Parks, March 2001.
Mixing Zones in Surface and Groundwater
- Statute: Montana Water Quality Act
  - 75-5-301(4), MCA
- Rules:
  - ARM 17.30.501 through 518
- Rules Summary
Nondegradation of Water Quality
- Statute: Montana Water Quality Act
  - 75-5-303, MCA
- Rules:
  - ARM 17.30.701 through 717
- Rules Summary
Short-term Exemption from Surface Water Quality Standards for Emergency Remediation/Pesticide Application
- Statute: Montana Water Quality Act
  - 75-5-308, MCA
Standards More Stringent than Federal Standards
- Statute: Montana Water Quality Act
  - 75-5-309, MCA
Site-specific Standards for Water Quality for Aquatic Life
- Statute: Montana Water Quality Act
  - 75-5-310, MCA
Temporary Water Quality Standards
- Statute: Montana Water Quality Act
  - 75-5-312, MCA
Outstanding Resource Waters
- Statute: Montana Water Quality Act
  - 75-5-315, 316, MCA
Nonsignificant Activities
- Statute: Montana Water Quality Act
  - 75-5-317, MCA
Short-term Water Quality Standards for Turbidity Related to Construction Activity
- Statute: Montana Water Quality Act
  - 75-5-318, MCA
Nutrient and algal biomass criteria recommendations for Northeastern Montana
Reference Study Report
Smith River Fecal Report

Department of Environmental Quality

Water Quality Information

Water Quality Standards Classifications