Water Quality | Sussex Development, Inc. | Heron Creek Subdivision| Lewis and Clark County | Comment Period Closes June 11, 2026
APPLICANT NAME:
Sussex Development, Inc.
FACILITY NAME:
Heron Creek Subdivision
FACILITY LOCATION:
NW ¼, Section 12, Township 10 North, Range 2 West
Lewis and Clark County
RECEIVING WATER:
Outfall 001 – Class I Ground Water
PERMIT NUMBER:
MTX000210
A determination has been made by DEQ to reissue Montana Ground Water Pollution Control System (MGWPCS) permit MTX000210 to Sussex Development Inc. for the Heron Creek Subdivision (Facility). This permitting action authorizes the discharge of treated wastewater to ground water and covers the continued operation and maintenance of the existing wastewater treatment and disposal system.
Wastewater generated within the Heron Creek Subdivision is domestic in nature and originates from single-family residences and condominium units. No commercial or industrial wastewater is received.
Wastewater from each lot receives primary treatment in individual septic tanks and is conveyed via a gravity collection system to a centralized treatment system. Secondary treatment is provided by an Advantex AX-100 recirculating trickling filter, with recirculation tanks facilitating treatment prior to discharge to a 4,000-gallon lift station.
Treated effluent is pumped from the lift station to one of two 3,400-gallon dose tanks and pressure dosed to subsurface drainfields for final disposal.
Discharge occurs through one permitted outfall (Outfall 001), which consists of two drainfield zones (001a and 001b). The system discharges treated effluent to Class I ground water via subsurface infiltration.
The facility is located in the NW ¼ of Section 12, Township 10 North, Range 2 West, Lewis and Clark County, Montana (Latitude: 46.64320°, Longitude: -111.80340°).
Associated Materials:
Comment Period Ends: June 11, 2026
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