River Rock County Water and Sewer District
EPA ID: MT0004082 · 4,200 people served · 1 ZIP code
River Rock County Water and Sewer District's five-year compliance history is clean by every EPA metric — no health-based violations, no monitoring lapses, no enforcement actions on record, reflecting consistent performance for a utility that supplies water to approximately 4,200 residents year after year.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for River Rock County Water and Sewer District Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The River Rock County Water and Sewer District serves a community with a median household income of $89,217 and an estimated 23,897 residents across its service area.
💧 Where Does Your Water Come From?
River Rock County Water and Sewer District's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 1% of homes in Gallatin County, Montana rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Wastewater Proximity Note: This service area ranks in the 60th percentile nationally for proximity to wastewater discharge points.
Superfund Proximity Note: This service area ranks in the 70th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in Montana
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
River Rock County Water and Sewer District (EPA ID: MT0004082) is a community water system in Montana that serves approximately 4,200 people from groundwater sources.
This system serves ZIP code 59714 in Belgrade.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by MT or modeled from parcel and building-footprint data.
- 59714 — Belgrade
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for River Rock County Water and Sewer District (MT0004082) on EPA.gov.
Frequently Asked Questions
Is River Rock County Water and Sewer District water safe to drink?
Based on EPA records, River Rock County Water and Sewer District has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does River Rock County Water and Sewer District serve?
River Rock County Water and Sewer District serves approximately 4,200 people across 1 ZIP code in Montana.
Where does River Rock County Water and Sewer District get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: Tested Clean
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were detected.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.