• Divisions
    • Director's Office
    • Enforcement
    • Centralized Services
    • Air, Energy & Mining
    • Water Quality
    • Waste Management & Remediation
  • CONTACTS
    • About Us
    • Affiliated Organizations
    • Contact Us
    • DEQ Staff Directory
    • DEQ Office Locations/Addresses
    • About Montana DEQ
      • Advisory Councils
      • Affiliated Organizations
      • Goal and Objectives
      • Organizational Structure
      • Our Mission
    • Board of Environmental Review
      • Board Authority
      • Board Policies
      • FAQs
      • Meeting Calender
      • Personnel Contacts
    • Director's Office
      • DEQ Business Processes
      • Goals and Objectives
      • Legal Unit
      • Organizational Chart
    • Environmental Links
      • EA: Environmental Assessments

      • EIS: Environmental Impact Statements

      • Major Facility Siting

      • Online Services

      • Today's Air
    • Permits
      • Air
      • Hazardous Waste
      • Mining
      • Solid Waste
      • Water Related
      • General Permits
    • Public Interest
      • DEQ Bids and Quotes
      • Legal and Public Notices
      • Press Releases
      • Public Comments
      • Public Meetings
      • Request Public Records

Drinking Water

  • Drinking Water Main Page
  • Understanding Your Drinking Water
  • Drinking Water Rules and Monitoring
  • Submit Water Sample Results
  • Source Water Assessment and Protection
  • Engineering and SRF
  • Circulars, Forms, and Regulations
  • Compliance Inspections

Surface Water

  • Surface Water Main Page
  • Clean Water Act Information Center
  • Monitoring Water Quality
  • Nonpoint Source Pollution
  • Watershed Restoration Planning
  • Water Quality Standards
  • Wetlands
  • Total Maximum Daily Loads
  • Submit Water Quality Data

Permits

  • Permit Main Page
  • Apply For or Renew Permit Online (FACTS)
  • Surface Water Discharge (MPDES)
  • Groundwater Discharge (MGWPCS)
  • Stormwater
  • Inspections and Noncompliance
  • NetDMR
  • 401 Certification | 318 Authorization
  • Public Comment and Legal Notices

Subdivisions

  • Subdivision Main Page
  • Subdivision Review and Approval
  • Circulars, Forms, and Regulations
  • Stormwater Permits
  • Public Comment and Legal Notices

Operator Certification

  • Operator Certification Main Page
  • Public Notices and Rule Changes

Public Information

  • Public Information Main Page
  • Circulars, Forms & Regulations
  • Advisory Councils and Stakeholders
  • Clean Water Act Information Center
  • Contracts and Grants
  • e-Services
  • Training
  • Public Comment, Legal Notices, and Public Meetings
  • Publications and Technical Reports

Forms, Circulars & Regulations

  • Circulars
  • Forms
  • Regulations

Contacts

  • Water Division Contacts
  • Agency Directory

Drinking Water

WaterFountain

Public Water Supply

  • Drinking Water Watch
  • Source Water Assessment and Protection
  • Engineering and State Revolving Fund
  • Drinking Water Rules and Monitoring
  • Emergency, Safety, and Preparedness
  • Compliance Inspections
ToolsTile

Tools and Data

  • Public Water Supply Monitoring Schedule
  • CMDP-Report Your Drinking Water Data
  • Water Supply Planning Guide for Montana Municipalities
  • Municipal Source Water Vulnerability Assessment Tool
  • Municipal Water Use Calculation Tool
DrinkingFountainTile

Understanding Your Drinking Water

  • What's in my Water?
  • Private Wells
  • Public Information Center
  • Public Water Supply Acute Contaminant Maps
  • PFAS (Per- and Polyfluoroalkyl Substances)
  • Lead Reduction in Schools Program

About Us

The Montana Department of Environmental Quality is charged with protecting a clean and healthy environment as guaranteed to our citizens by our State Constitution. Our ultimate goal is to protect public health and to maintain Montana's high quality of life for current and future generations.

Latest News

DEQ Issues Responses to Public Comments and...

Driscoll, Paul / Tuesday, February 18, 2020 0 205

Revised Remedy Evaluation Report, Units 3&4 Effluent Holding Pond (EHP)

Read more
RSS

Latest Tweets

Tweets by MTDEQ

Follow Us