Montana
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Water Quality Standards for Montana |
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- Water Quality Standards Provisions
in Montana's Water Quality Act, Title 75 - Environmental Protection,
Chapter 5 - Water Quality - (PDF, 4M)
- (Effective October 1999) Water quality standards enacted
by Montana State legislature.
- Mixing Zones in Surface and
Ground Water - Sub-chapter 5 (17.30.501 - 17.30.518)
- (PDF, 1.1M)
- (Effective September 1998) This subchapter contains rules
governing the granting of mixing zones.
- Surface Water Quality Standards
and Procedures - Sub-chapter 6 (17.30.601 - 17.30.646) -
(PDF, 539KB)
- (Effective August 28, 2003)
- Nondegradation of Water Quality
- Sub-chapter 7 (17.30.701 - 17.30.717) - (PDF, 137KB)
- (Effective August 28, 2003) This subchapter contains the
implementation procedures for implementing the nondegradation
policy contained in 75-5-303 of Montana's Water Quality Act.
- Circular WQB-7, Montana Numeric Water
Quality Standards - (PDF, 4.7M)
- (Effective September 1999) This document contains numeric
water quality criteria for Montana surface and ground waters.
Montana's water quality standards are applicable to "waters
of the State". In some limited instances, the definition
adopted by Montana for "waters of the State" as part
of its water quality standards may result in water quality standards
that are more comprehensive than required under section 303(c)
of the Clean Water Act and the implementing federal regulations.
Specifically, Montana has adopted additional provisions related
to groundwater that are outside the scope of the Clean Water Act
and implementing federal regulations. EPA has included the State's
water quality standards in their entirety here for context and
as supplementary information for the reader.
Montana water quality standards apply to all waters within the
State of Montana, with the exception of those waters that are
within Indian Country, as defined in 18 U.S.C. Section 1151. EPA's
approval of Montana's water quality standards was not intended
as an action to approve or disapprove water quality standards
applying to waters within Indian Country. EPA, or eligible Indian
Tribes, as appropriate, will retain responsibilities for water
quality standards within Indian Country.
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