Water Quality | Grass Valley Gardens, LLC | Grass Valley Gardens Residential Subdivision | Comment Period Closes May 21, 2025
APPLICANT:
Grass Valley Gardens, LLC
FACILITY NAME:
Grass Valley Gardens Residential Subdivision
FACILITY LOCATION:
14N 20W 20SW
Missoula County
46.955904ᵒ -114.162644ᵒ
RECEIVING WATER:
Outfall 001 - Class I Ground Water
PERMIT NUMBER:
MTX000331
A determination has been made by the Department of Environmental Quality (DEQ) to issue a new Montana Ground Water Pollution Control System permit, MTX000331, to Grass Valley Gardens LLC, for the proposed Grass Valley Gardens Residential Subdivision. This permitting action authorizes discharge of treated wastewater to ground water. The scope of this permitting action is for the operation and maintenance of the proposed wastewater treatment and disposal system.
The Grass Valley Gardens Residential Subdivision is designed to handle up to 120,000 gallons per day of domestic wastewater. Wastewater treatment and disposal will be managed through a Membrane Bioreactor (MBR) and a Rapid Infiltration system (RIC). The planned discharge infrastructure includes a lift station that will transport treated effluent to a RIC system located at the southern end of the development.
The proposed facility will use subsurface structures (Outfall 001) to discharge treated wastewater to underlying groundwater. The discharge structure’s proposed location is 46.951529°-114.160508°, 14N 20W 20SW, Missoula County.
DEQ recognizes that in comparison to conventional septic treatment, the proposed advanced treatment system may provide a higher level of treatment for nutrients.
Associated Materials:
Send Comments To:
DEQ Water Quality Division
Water Protection Bureau
PO Box 200901
Helena, MT 59620
Or electronically to: DEQWPBPublicComments@mt.gov
Tags: MEPA, Public Comment and Water