ASSINIBOINE & SIOUX RURAL WATER SYSTEM

POPLAR, MT · ~1,726 people served

Check your exact address → POPLAR overview

100

Excellent

PurityRadar safety score

PWSID

083090050

State

Montana

City

POPLAR

Population served

1,726

Primary source

Surface water

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 100

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Sep 2025. Official EPA record →

Monitoring & reporting · Haloacetic acids (HAA5) began Apr 2025 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Apr 2025 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Sep 2023 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Sep 2023 Resolved

Monitoring · Lead & Copper Rule began Jan 2018 Resolved

Treatment technique · Bromate health-based began Apr 2015 Resolved

Treatment technique · Bromate health-based began Jan 2015 Resolved

Treatment technique · Bromate health-based began Oct 2014 Resolved

Treatment technique · Bromate health-based began Jul 2014 Resolved

Treatment technique · Bromate health-based began Apr 2014 Resolved

Treatment technique · EPA contaminant 0300 health-based began Jun 2013 Resolved

Recent enforcement actions

State action · SOX Sep 2025
State action · SIF Feb 2024
State action · SOX Feb 2024
State action · SOX Feb 2018
State action · SOX Nov 2015
State action · SOX Aug 2013
State action · SIE Jul 2013
State action · SIA Jul 2013

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Nitrate

20 stations · latest Sep 2021

15.2 · max 73 mg/l as N · 82

Fluoride

21 stations · latest Sep 2021

0.39 · max 1.12 mg/l · 21

Manganese

14 stations · latest Sep 2021

0.645 · max 287 ug/l · 14

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system 083090050 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.