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States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 090400244

WMATUA Carrizo

Whiteriver, EPA Region 9 — Tribal Water Systems 85941 - drinking water served from groundwater sources to 228 people, tracked in EPA SDWIS and UCMR5.

228
People served
126
EPA violations
3
Health-based
Untested
UCMR5 result

The verdict

EPA records 126 drinking-water violations at WMATUA Carrizo, 2% of them health-based.

126
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
228
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: WMATUA Carrizo

WMATUA Carrizo is a native american-owned community water system that delivers drinking water to 228 residents in Whiteriver, EPA Region 9 — Tribal Water Systems through 40 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 126 total violations for this system , of which 3 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 84 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 15 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
228
Total Violations
126
Health-Based Violations
3
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
40
School/Daycare
No
MCL Violations
1
Monitoring Violations
84
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 15 2015
Nitrate MR 7 2007
Total Haloacetic Acids (HAA5) MR 4 2021
TTHM MR 4 2021
Consumer Confidence Rule Other 3 2004
LEAD AND COPPER RULE REVISIONS TT 2 2024
Endrin MR 1 2004
BHC-GAMMA MR 1 2004
Diquat MR 1 2004
Di(2-ethylhexyl) adipate MR 1 2004
OXAMYL MR 1 2004
Simazine MR 1 2004
Di(2-ethylhexyl) phthalate MR 1 2004
Dinoseb MR 1 2004
Hexachlorocyclopentadiene MR 1 2004
LASSO MR 1 2004
Heptachlor MR 1 2004
2,4-D MR 1 2004
1,2-DIBROMO-3-CHLOROPROPANE MR 1 2004
Benzo(a)pyrene MR 1 2004
Pentachlorophenol MR 1 2004
1,2,4-Trichlorobenzene MR 1 2004
cis-1,2-Dichloroethylene MR 1 2004
ETHYLENE DIBROMIDE MR 1 2004
Xylenes, Total MR 1 2004
p-Dichlorobenzene MR 1 2004
Vinyl chloride MR 1 2004
1,1-Dichloroethylene MR 1 2004
trans-1,2-Dichloroethylene MR 1 2004
1,2-Dichloroethane MR 1 2004

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 WMATUA Carrizo.

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 090400244 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 / 090400244 / 5200
2021 Total Haloacetic Acids (HAA5) MR 4 SDWIS / 090400244 / 2456
2021 TTHM MR 4 SDWIS / 090400244 / 2950
2015 Coliform (TCR) MR 15 SDWIS / 090400244 / 3100
2007 Nitrate MR 7 SDWIS / 090400244 / 1040
2007 Combined Uranium MR 1 SDWIS / 090400244 / 4006
2007 Combined Radium (-226 and -228) MR 1 SDWIS / 090400244 / 4010
2007 Gross Alpha, Excl. Radon and U MR 1 SDWIS / 090400244 / 4000
2004 Consumer Confidence Rule Other 3 SDWIS / 090400244 / 7000
2004 Endrin MR 1 SDWIS / 090400244 / 2005
2004 BHC-GAMMA MR 1 SDWIS / 090400244 / 2010
2004 Diquat MR 1 SDWIS / 090400244 / 2032
2004 Di(2-ethylhexyl) adipate MR 1 SDWIS / 090400244 / 2035
2004 OXAMYL MR 1 SDWIS / 090400244 / 2036
2004 Simazine MR 1 SDWIS / 090400244 / 2037

How WMATUA Carrizo Compares

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

Metric WMATUA Carrizo EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 126 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 3 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 228 - 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 WMATUA Carrizo water safe to drink? ▼
WMATUA Carrizo (PWS ID: 090400244) has 126 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 228 people using Groundwater sources.
How many people does WMATUA Carrizo serve? ▼
WMATUA Carrizo serves 228 people in Whiteriver, EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 40 service connections.
What type of violations does WMATUA Carrizo have? ▼
WMATUA Carrizo has 126 total violations: 3 health-based violations (MCL exceedances or treatment failures), 84 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in WMATUA Carrizo water? ▼
No PFAS testing data is available for WMATUA Carrizo under the EPA's UCMR5 monitoring program.
What water source does WMATUA Carrizo use? ▼
WMATUA Carrizo 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.