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States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 090400047

GRIC DPW Sacaton

Sacaton, EPA Region 9 — Tribal Water Systems 85147 - drinking water served from groundwater sources to 5,307 people, tracked in EPA SDWIS and UCMR5.

5,307
People served
90
EPA violations
12
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 90 drinking-water violations at GRIC DPW Sacaton, 13% of them health-based.

90
Total EPA violations on record
13%
Health-based (MCL / treatment failure)
5,307
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: GRIC DPW Sacaton

GRIC DPW Sacaton is a native american-owned community water system that delivers drinking water to 5,307 residents in Sacaton, EPA Region 9 — Tribal Water Systems through 1,449 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 90 total violations for this system , of which 12 (13%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 50 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 26 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

EPA Region 9 — 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
5,307
Total Violations
90
Health-Based Violations
12
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
1,449
School/Daycare
No
MCL Violations
10
Monitoring Violations
50
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 26 2008
Coliform (TCR) MCL 8 2010
Nitrate MR 5 2023
Lead and Copper Rule MR 4 2023
Arsenic MR 2 1996
Barium MR 2 1996
Cadmium MR 2 1996
Chromium MR 2 1996
Fluoride MR 2 1996
LEAD AND COPPER RULE REVISIONS TT 2 2024
Mercury MR 2 1996
Selenium MR 2 1996
Nitrate MCL 1 2009
Consumer Confidence Rule Other 1 2001
Gross Alpha, Excl. Radon and U MCL 1 2001
Revised Total Coliform Rule RPT 1 2024
Combined Uranium MR 1 2023

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 174 samples detected PFAS.

Contaminant Date Result MRL Status
6:2 FTS 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 4/3/2023 <6.00 ppt 6.00 ppt Not Detected
PFPeS 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 4/3/2023 <20.00 ppt 20.00 ppt Not Detected
PFEESA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFTrDA 4/3/2023 <7.00 ppt 7.00 ppt Not Detected
PFTA 4/3/2023 <8.00 ppt 8.00 ppt Not Detected
PFPeA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
NEtFOSAA 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFNA 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
ADONA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFUnA 4/3/2023 <2.00 ppt 2.00 ppt Not Detected
PFHxA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 4/3/2023 <2.00 ppt 2.00 ppt Not Detected
PFOS 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFBS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 4/3/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 4/3/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFDA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 4/3/2023 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFHpS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 4/3/2023 <8.00 ppt 8.00 ppt Not Detected
NFDHA 4/3/2023 <20.00 ppt 20.00 ppt Not Detected
PFPeS 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected

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 GRIC DPW Sacaton.

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 090400047 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 9 — Tribal Water Systems Drinking Water Authority

EPA Region 9 — 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 09 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 2 SDWIS / 090400047 / 5200
2024 Revised Total Coliform Rule RPT 1 SDWIS / 090400047 / 8000
2023 Nitrate MR 5 SDWIS / 090400047 / 1040
2023 Lead and Copper Rule MR 4 SDWIS / 090400047 / 5000
2023 Combined Uranium MR 1 SDWIS / 090400047 / 4006
2010 Coliform (TCR) MCL 8 SDWIS / 090400047 / 3100
2009 Nitrate MCL 1 SDWIS / 090400047 / 1040
2008 Coliform (TCR) MR 26 SDWIS / 090400047 / 3100
2001 Consumer Confidence Rule Other 1 SDWIS / 090400047 / 7000
2001 Gross Alpha, Excl. Radon and U MCL 1 SDWIS / 090400047 / 4000
1996 Arsenic MR 2 SDWIS / 090400047 / 1005
1996 Barium MR 2 SDWIS / 090400047 / 1010
1996 Cadmium MR 2 SDWIS / 090400047 / 1015
1996 Chromium MR 2 SDWIS / 090400047 / 1020
1996 Fluoride MR 2 SDWIS / 090400047 / 1025

How GRIC DPW Sacaton Compares

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

Metric GRIC DPW Sacaton EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 90 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 12 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 5,307 - 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 9 — 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 GRIC DPW Sacaton water safe to drink? ▼
GRIC DPW Sacaton (PWS ID: 090400047) has 90 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 5,307 people using Groundwater sources.
How many people does GRIC DPW Sacaton serve? ▼
GRIC DPW Sacaton serves 5,307 people in Sacaton, EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 1,449 service connections.
What type of violations does GRIC DPW Sacaton have? ▼
GRIC DPW Sacaton has 90 total violations: 12 health-based violations (MCL exceedances or treatment failures), 50 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in GRIC DPW Sacaton water? ▼
No. GRIC DPW Sacaton was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does GRIC DPW Sacaton use? ▼
GRIC DPW Sacaton 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. PFAS data from EPA UCMR5 monitoring program (2023-2025). 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.