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States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 090400092

GRIC DPW Casa Blanca_Bapchule

Sacaton, EPA Region 9 — Tribal Water Systems 85147 - drinking water served from groundwater sources to 2,603 people, tracked in EPA SDWIS and UCMR5.

2,603
People served
74
EPA violations
11
Health-based
Untested
UCMR5 result

The verdict

EPA records 74 drinking-water violations at GRIC DPW Casa Blanca_Bapchule, 15% of them health-based.

74
Total EPA violations on record
15%
Health-based (MCL / treatment failure)
2,603
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: GRIC DPW Casa Blanca_Bapchule

GRIC DPW Casa Blanca_Bapchule is a native american-owned community water system that delivers drinking water to 2,603 residents in Sacaton, EPA Region 9 — Tribal Water Systems through 719 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 74 total violations for this system , of which 11 (15%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 38 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 11 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 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
2,603
Total Violations
74
Health-Based Violations
11
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
719
School/Daycare
No
MCL Violations
9
Monitoring Violations
38
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 11 1996
Coliform (TCR) MCL 9 2009
Nitrate MR 6 2023
Mercury MR 3 2001
Lead and Copper Rule MR 3 2023
Arsenic MR 2 1996
Barium MR 2 1996
Cadmium MR 2 1996
Fluoride MR 2 1996
Chromium MR 2 1996
Selenium MR 2 1996
LEAD AND COPPER RULE REVISIONS TT 2 2024
BHC-GAMMA MR 1 2001
Total Polychlorinated Biphenyls (PCB) MR 1 2001
Xylenes, Total MR 1 2001
Consumer Confidence Rule Other 1 2001

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 Casa Blanca_Bapchule.

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 090400092 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 / 090400092 / 5200
2023 Nitrate MR 6 SDWIS / 090400092 / 1040
2023 Lead and Copper Rule MR 3 SDWIS / 090400092 / 5000
2009 Coliform (TCR) MCL 9 SDWIS / 090400092 / 3100
2001 Mercury MR 3 SDWIS / 090400092 / 1035
2001 BHC-GAMMA MR 1 SDWIS / 090400092 / 2010
2001 Total Polychlorinated Biphenyls (PCB) MR 1 SDWIS / 090400092 / 2383
2001 Xylenes, Total MR 1 SDWIS / 090400092 / 2955
2001 Consumer Confidence Rule Other 1 SDWIS / 090400092 / 7000
1996 Coliform (TCR) MR 11 SDWIS / 090400092 / 3100
1996 Arsenic MR 2 SDWIS / 090400092 / 1005
1996 Barium MR 2 SDWIS / 090400092 / 1010
1996 Cadmium MR 2 SDWIS / 090400092 / 1015
1996 Fluoride MR 2 SDWIS / 090400092 / 1025
1996 Chromium MR 2 SDWIS / 090400092 / 1020

How GRIC DPW Casa Blanca_Bapchule Compares

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

Metric GRIC DPW Casa Blanca_Bapchule EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 74 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 11 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 2,603 - 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 Casa Blanca_Bapchule water safe to drink? ▼
GRIC DPW Casa Blanca_Bapchule (PWS ID: 090400092) has 74 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,603 people using Groundwater sources.
How many people does GRIC DPW Casa Blanca_Bapchule serve? ▼
GRIC DPW Casa Blanca_Bapchule serves 2,603 people in Sacaton, EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 719 service connections.
What type of violations does GRIC DPW Casa Blanca_Bapchule have? ▼
GRIC DPW Casa Blanca_Bapchule has 74 total violations: 11 health-based violations (MCL exceedances or treatment failures), 38 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 Casa Blanca_Bapchule water? ▼
No PFAS testing data is available for GRIC DPW Casa Blanca_Bapchule under the EPA's UCMR5 monitoring program.
What water source does GRIC DPW Casa Blanca_Bapchule use? ▼
GRIC DPW Casa Blanca_Bapchule 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.