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States → EPA Region 9 — Tribal Water Systems

Non-Transient Non-Community Water System · PWS 090605144

Cahuilla Casino

Anza, EPA Region 9 — Tribal Water Systems 92539 - drinking water served from groundwater sources to 515 people, tracked in EPA SDWIS and UCMR5.

515
People served
141
EPA violations
2
Health-based
Untested
UCMR5 result

The verdict

EPA records 141 drinking-water violations at Cahuilla Casino, 1% of them health-based.

141
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
515
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Cahuilla Casino

Cahuilla Casino is a native american-owned non-transient non-community water system that delivers drinking water to 515 residents in Anza, EPA Region 9 — Tribal Water Systems through 4 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 141 total violations for this system , of which 2 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 105 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 Nitrate, recorded in 7 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
515
Total Violations
141
Health-Based Violations
2
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Native American
Connections
4
School/Daycare
No
MCL Violations
2
Monitoring Violations
105
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrate MR 7 2016
Endrin MR 2 2004
BHC-GAMMA MR 2 2004
Toxaphene MR 2 2004
Dalapon MR 2 2004
Diquat MR 2 2004
Endothall MR 2 2004
Di(2-ethylhexyl) adipate MR 2 2004
OXAMYL MR 2 2004
Simazine MR 2 2004
Dinoseb MR 2 2004
Carbofuran MR 2 2004
Hexachlorocyclopentadiene MR 2 2004
Atrazine MR 2 2004
2,3,7,8-TCDD MR 2 2004
Heptachlor MR 2 2004
Heptachlor epoxide MR 2 2004
2,4-D MR 2 2004
2,4,5-TP MR 2 2004
Benzo(a)pyrene MR 2 2004
Pentachlorophenol MR 2 2004
Total Polychlorinated Biphenyls (PCB) MR 2 2004
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2004
ETHYLENE DIBROMIDE MR 2 2004
Chlordane MR 2 2004
Gross Alpha, Excl. Radon and U MR 2 2004
Coliform (TCR) MCL 2 2000
Asbestos MR 2 2004
Methoxychlor MR 2 2004
LASSO MR 2 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 Cahuilla Casino.

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 090605144 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 Revised Total Coliform Rule RPT 2 SDWIS / 090605144 / 8000
2022 Chlorine MR 1 SDWIS / 090605144 / 0999
2016 Nitrate MR 7 SDWIS / 090605144 / 1040
2013 Stage 2 Disinfectants and Disinfection Byproducts Rule MR 1 SDWIS / 090605144 / 0600
2005 Lead and Copper Rule MR 1 SDWIS / 090605144 / 5000
2004 Endrin MR 2 SDWIS / 090605144 / 2005
2004 BHC-GAMMA MR 2 SDWIS / 090605144 / 2010
2004 Toxaphene MR 2 SDWIS / 090605144 / 2020
2004 Dalapon MR 2 SDWIS / 090605144 / 2031
2004 Diquat MR 2 SDWIS / 090605144 / 2032
2004 Endothall MR 2 SDWIS / 090605144 / 2033
2004 Di(2-ethylhexyl) adipate MR 2 SDWIS / 090605144 / 2035
2004 OXAMYL MR 2 SDWIS / 090605144 / 2036
2004 Simazine MR 2 SDWIS / 090605144 / 2037
2004 Dinoseb MR 2 SDWIS / 090605144 / 2041

How Cahuilla Casino Compares

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

Metric Cahuilla Casino EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 141 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 2 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 515 - 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 Cahuilla Casino water safe to drink? ▼
Cahuilla Casino (PWS ID: 090605144) has 141 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 515 people using Groundwater sources.
How many people does Cahuilla Casino serve? ▼
Cahuilla Casino serves 515 people in Anza, EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 4 service connections.
What type of violations does Cahuilla Casino have? ▼
Cahuilla Casino has 141 total violations: 2 health-based violations (MCL exceedances or treatment failures), 105 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Cahuilla Casino water? ▼
No PFAS testing data is available for Cahuilla Casino under the EPA's UCMR5 monitoring program.
What water source does Cahuilla Casino use? ▼
Cahuilla Casino uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.