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States → EPA Region 10 — Tribal Water Systems

Community Water System · PWS 101600002

Coeur D'alene Sub-Agency

Plummer, EPA Region 10 — Tribal Water Systems 83851 - drinking water served from groundwater sources to 50 people, tracked in EPA SDWIS and UCMR5.

50
People served
399
EPA violations
5
Health-based
Untested
UCMR5 result

The verdict

EPA records 399 drinking-water violations at Coeur D'alene Sub-Agency, 1% of them health-based.

399
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
50
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Coeur D'alene Sub-Agency

Coeur D'alene Sub-Agency is a native american-owned community water system that delivers drinking water to 50 residents in Plummer, EPA Region 10 — Tribal Water Systems through 20 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 399 total violations for this system , of which 5 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 386 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 18 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

EPA Region 10 — Tribal Water Systems has thousands of regulated public water systems tracked by EPA under the Safe Drinking Water Act.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
50
Total Violations
399
Health-Based Violations
5
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
20
School/Daycare
No
MCL Violations
0
Monitoring Violations
386
Treatment Tech Violations
5

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 18 2014
2,3,7,8-TCDD MR 8 2015
Combined Radium (-226 and -228) MR 8 2020
Endrin MR 7 2015
Dalapon MR 7 2015
Endothall MR 7 2015
Di(2-ethylhexyl) adipate MR 7 2015
Di(2-ethylhexyl) phthalate MR 7 2015
BHC-GAMMA MR 7 2015
Methoxychlor MR 7 2015
Diquat MR 7 2015
Glyphosate MR 7 2015
OXAMYL MR 7 2015
Simazine MR 7 2015
Hexachlorocyclopentadiene MR 7 2015
Dinoseb MR 7 2015
Carbofuran MR 7 2015
2,4-D MR 7 2015
2,4,5-TP MR 7 2015
HEXACHLOROBENZENE MR 7 2015
Pentachlorophenol MR 7 2015
1,2-DIBROMO-3-CHLOROPROPANE MR 7 2015
Atrazine MR 7 2015
Toxaphene MR 7 2015
LASSO MR 7 2015
Picloram MR 7 2015
Total Polychlorinated Biphenyls (PCB) MR 7 2015
ETHYLENE DIBROMIDE MR 7 2015
Heptachlor MR 7 2015
Heptachlor epoxide MR 7 2015

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Coeur D'alene Sub-Agency.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID 101600002 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 10 — Tribal Water Systems Drinking Water Authority

EPA Region 10 — Tribal Water Systems's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find 10 regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2024 LEAD AND COPPER RULE REVISIONS TT 1 SDWIS / 101600002 / 5200
2023 Total Haloacetic Acids (HAA5) MR 2 SDWIS / 101600002 / 2456
2023 TTHM MR 2 SDWIS / 101600002 / 2950
2020 Combined Radium (-226 and -228) MR 8 SDWIS / 101600002 / 4010
2017 Gross Alpha, Excl. Radon and U MR 7 SDWIS / 101600002 / 4000
2017 Combined Uranium MR 6 SDWIS / 101600002 / 4006
2017 Chlorine MR 5 SDWIS / 101600002 / 0999
2017 Revised Total Coliform Rule MON 1 SDWIS / 101600002 / 8000
2015 2,3,7,8-TCDD MR 8 SDWIS / 101600002 / 2063
2015 Endrin MR 7 SDWIS / 101600002 / 2005
2015 Dalapon MR 7 SDWIS / 101600002 / 2031
2015 Endothall MR 7 SDWIS / 101600002 / 2033
2015 Di(2-ethylhexyl) adipate MR 7 SDWIS / 101600002 / 2035
2015 Di(2-ethylhexyl) phthalate MR 7 SDWIS / 101600002 / 2039
2015 BHC-GAMMA MR 7 SDWIS / 101600002 / 2010

How Coeur D'alene Sub-Agency Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Coeur D'alene Sub-Agency EPA Region 10 — Tribal Water Systems avg Federal benchmark
Total violations 399 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 5 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 50 - Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across all regulated public water systems in EPA Region 10 — Tribal Water Systems.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Coeur D'alene Sub-Agency water safe to drink? ▼
Coeur D'alene Sub-Agency (PWS ID: 101600002) has 399 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 50 people using Groundwater sources.
How many people does Coeur D'alene Sub-Agency serve? ▼
Coeur D'alene Sub-Agency serves 50 people in Plummer, EPA Region 10 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 20 service connections.
What type of violations does Coeur D'alene Sub-Agency have? ▼
Coeur D'alene Sub-Agency has 399 total violations: 5 health-based violations (MCL exceedances or treatment failures), 386 monitoring/reporting violations, and 5 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Coeur D'alene Sub-Agency water? ▼
No PFAS testing data is available for Coeur D'alene Sub-Agency under the EPA's UCMR5 monitoring program.
What water source does Coeur D'alene Sub-Agency use? ▼
Coeur D'alene Sub-Agency uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.