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Porcupine, ND Tap Water Quality 2026

Water quality report for Porcupine, ND — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Porcupine's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Standing Rock Rural Water System PWSID: 084690510 Updated: 2026 Q2
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1 violation currently open

Lead is 6.27 ppb, 42% of the action level. No PFAS was detected.

D

Porcupine earns a D for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 6.27 ppb — 42% of the federal action level
PFAS tested, none detected
41 violations since 2015, 1 health-based
1 violation currently open
Porcupine's lead level vs. all North Dakota community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 6.27 ppb — 42% of the federal action level
✓ Lower lead than 10% of North Dakota utilities
Population Served
197
~1389 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
1
1 open of 41 since 2015

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
42% of EPA action level
6.27 ppb
Action level: 15 ppb
The 90th-percentile lead result is 6.27 ppb, 42% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Long Term 2 Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2026 Archived
Long Term 2 Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2026 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2024 Unaddressed
Consumer Confidence Rule OTHER — — 2024 Unaddressed
Long Term 2 Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2023 Resolved
Endrin MONITORING AND REPORTING — 0.002 mg/L 2023–2025 Archived
BHC-GAMMA MONITORING AND REPORTING — 0.0002 mg/L 2023–2025 Archived
Methoxychlor MONITORING AND REPORTING — 0.04 mg/L 2023–2025 Archived
Toxaphene MONITORING AND REPORTING — 0.003 mg/L 2023–2025 Archived
Dalapon MONITORING AND REPORTING — 0.2 mg/L 2023–2025 Archived
Diquat MONITORING AND REPORTING — 0.02 mg/L 2023–2025 Archived
Endothall MONITORING AND REPORTING — 0.1 mg/L 2023–2025 Archived
Glyphosate MONITORING AND REPORTING — 0.7 mg/L 2023–2025 Archived
Di(2-ethylhexyl) adipate MONITORING AND REPORTING — 0.4 mg/L 2023–2025 Archived
OXAMYL MONITORING AND REPORTING — 0.2 mg/L 2023–2025 Archived
Simazine MONITORING AND REPORTING — 0.004 mg/L 2023–2025 Archived
Di(2-ethylhexyl) phthalate MONITORING AND REPORTING — 0.006 mg/L 2023–2025 Archived
Picloram MONITORING AND REPORTING — 0.5 mg/L 2023–2025 Archived
Dinoseb MONITORING AND REPORTING — 0.007 mg/L 2023–2025 Archived
Hexachlorocyclopentadiene MONITORING AND REPORTING — 0.05 mg/L 2023–2025 Archived
Carbofuran MONITORING AND REPORTING — 0.04 mg/L 2023–2025 Archived
Atrazine MONITORING AND REPORTING — 0.003 mg/L 2023–2025 Archived
LASSO MONITORING AND REPORTING — — 2023–2025 Archived
Heptachlor MONITORING AND REPORTING — 0.0004 mg/L 2023–2025 Archived
Heptachlor epoxide MONITORING AND REPORTING — 0.0002 mg/L 2023–2025 Archived
2,4-D MONITORING AND REPORTING — 0.07 mg/L 2023–2025 Archived
2,4,5-TP MONITORING AND REPORTING — 0.05 mg/L 2023–2025 Archived
HEXACHLOROBENZENE MONITORING AND REPORTING — 0.001 mg/L 2023–2025 Archived
Benzo(a)pyrene MONITORING AND REPORTING — 0.0002 mg/L 2023–2025 Archived
Pentachlorophenol MONITORING AND REPORTING — 0.001 mg/L 2023–2025 Archived
Total Polychlorinated Biphenyls (PCB) MONITORING AND REPORTING — 0.0005 mg/L 2023–2025 Archived
1,2-DIBROMO-3-CHLOROPROPANE MONITORING AND REPORTING — 0.0002 mg/L 2023–2025 Archived
ETHYLENE DIBROMIDE MONITORING AND REPORTING — 0.00005 mg/L 2023–2025 Archived
Chlordane MONITORING AND REPORTING — 0.002 mg/L 2023–2025 Archived
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2020–2025 Archived
Combined Uranium MONITORING AND REPORTING — 30 ug/L 2020–2025 Archived
Combined Radium (-226 and -228) MONITORING AND REPORTING — 5 pCi/L 2020–2025 Archived
Radium-226 MONITORING AND REPORTING — — 2020–2025 Archived
Radium-228 MONITORING AND REPORTING — — 2020–2025 Archived
Long Term 2 Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2017 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

1 violation remains open, out of 41 recorded since 2015 (1 health-based).

About the Main Water System

Utility Standing Rock Rural Water System
PWSID 084690510
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 197
Service connections 1,389
Systems serving this area 1
Regulator US EPA (tribal primacy)
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Porcupine tap water safe to drink? ▼
No federal limit is exceeded on record. 1 violation(s) remain open. Lead is 6.27 ppb, 42% of the action level.
Does Porcupine water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Porcupine? ▼
Standing Rock Rural Water System (PWSID 084690510). Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2024-08-07. Inspectors recorded 1 significant deficiency.

What Should Porcupine Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Follow the open violation
This system has an unresolved violation. Contact the supplier for its corrective-action schedule.

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