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States → EPA Region 6 — Tribal Water Systems

Non-Transient Non-Community Water System · PWS 063503118

Santa Ana Westside

Santa Ana Pueblo, EPA Region 6 — Tribal Water Systems 87004 - drinking water served from groundwater sources to 10,691 people, tracked in EPA SDWIS and UCMR5.

10,691
People served
147
EPA violations
19
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 147 drinking-water violations at Santa Ana Westside, 13% of them health-based.

147
Total EPA violations on record
13%
Health-based (MCL / treatment failure)
10,691
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Santa Ana Westside

Santa Ana Westside is a native american-owned non-transient non-community water system that delivers drinking water to 10,691 residents in Santa Ana Pueblo, EPA Region 6 — Tribal Water Systems through 33 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 147 total violations for this system , of which 19 (13%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 116 monitoring and reporting violations are on file. The most recent violation on record dates to 2020.

The most frequently cited contaminant at this system is Arsenic, recorded in 17 violations (MCL, health-based). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

EPA Region 6 — 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
10,691
Total Violations
147
Health-Based Violations
19
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Native American
Connections
33
School/Daycare
No
MCL Violations
17
Monitoring Violations
116
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MCL 17 2020
Coliform (TCR) MR 11 2011
Arsenic MR 3 2010
Endothall MR 2 2010
Dalapon MR 2 2010
Di(2-ethylhexyl) adipate MR 2 2010
Di(2-ethylhexyl) phthalate MR 2 2010
Picloram MR 2 2010
Dinoseb MR 2 2010
LASSO MR 2 2010
2,4-D MR 2 2010
2,4,5-TP MR 2 2010
Benzo(a)pyrene MR 2 2010
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2010
Chlordane MR 2 2010
cis-1,2-Dichloroethylene MR 2 2010
Xylenes, Total MR 2 2010
DICHLOROMETHANE MR 2 2010
trans-1,2-Dichloroethylene MR 2 2010
1,2-Dichloroethane MR 2 2010
1,1,1-Trichloroethane MR 2 2010
Carbon tetrachloride MR 2 2010
1,2-Dichloropropane MR 2 2010
1,1,2-Trichloroethane MR 2 2010
Tetrachloroethylene MR 2 2010
Benzene MR 2 2010
Toluene MR 2 2010
1,2,4-Trichlorobenzene MR 2 2010
o-Dichlorobenzene MR 2 2010
p-Dichlorobenzene MR 2 2010

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 87 samples detected PFAS.

Contaminant Date Result MRL Status
PFDoA 9/23/2025 <3.00 ppt 3.00 ppt Not Detected
PFHxA 9/23/2025 <3.00 ppt 3.00 ppt Not Detected
PFUnA 9/23/2025 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 9/23/2025 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 9/23/2025 <3.00 ppt 3.00 ppt Not Detected
PFDA 9/23/2025 <3.00 ppt 3.00 ppt Not Detected
PFHpS 9/23/2025 <3.00 ppt 3.00 ppt Not Detected
PFTA 9/23/2025 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 9/23/2025 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 9/23/2025 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 9/23/2025 <6.00 ppt 6.00 ppt Not Detected
9Cl-PF3ONS 9/23/2025 <2.00 ppt 2.00 ppt Not Detected
HFPO-DA 9/23/2025 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 9/23/2025 <5.00 ppt 5.00 ppt Not Detected
PFPeS 9/23/2025 <4.00 ppt 4.00 ppt Not Detected
PFBA 9/23/2025 <5.00 ppt 5.00 ppt Not Detected
PFOA 9/23/2025 <4.00 ppt 4.00 ppt Not Detected
ADONA 9/23/2025 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 9/23/2025 <5.00 ppt 5.00 ppt Not Detected
PFMPA 9/23/2025 <4.00 ppt 4.00 ppt Not Detected
PFPeA 9/23/2025 <3.00 ppt 3.00 ppt Not Detected
PFMBA 9/23/2025 <3.00 ppt 3.00 ppt Not Detected
PFEESA 9/23/2025 <3.00 ppt 3.00 ppt Not Detected
NFDHA 9/23/2025 <20.00 ppt 20.00 ppt Not Detected
PFBS 9/23/2025 <3.00 ppt 3.00 ppt Not Detected
PFHpA 9/23/2025 <3.00 ppt 3.00 ppt Not Detected
PFHxS 9/23/2025 <3.00 ppt 3.00 ppt Not Detected
PFNA 9/23/2025 <4.00 ppt 4.00 ppt Not Detected
PFOS 9/23/2025 <4.00 ppt 4.00 ppt Not Detected
PFHxA 3/13/2025 <3.00 ppt 3.00 ppt Not Detected
PFPeS 3/13/2025 <4.00 ppt 4.00 ppt Not Detected
NFDHA 3/13/2025 <20.00 ppt 20.00 ppt Not Detected
PFTA 3/13/2025 <8.00 ppt 8.00 ppt Not Detected
PFMBA 3/13/2025 <3.00 ppt 3.00 ppt Not Detected
PFMPA 3/13/2025 <4.00 ppt 4.00 ppt Not Detected
6:2 FTS 3/13/2025 <5.00 ppt 5.00 ppt Not Detected
PFBA 3/13/2025 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 3/13/2025 <5.00 ppt 5.00 ppt Not Detected
ADONA 3/13/2025 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 3/13/2025 <2.00 ppt 2.00 ppt Not Detected
PFHpS 3/13/2025 <3.00 ppt 3.00 ppt Not Detected
PFUnA 3/13/2025 <2.00 ppt 2.00 ppt Not Detected
PFEESA 3/13/2025 <3.00 ppt 3.00 ppt Not Detected
PFDoA 3/13/2025 <3.00 ppt 3.00 ppt Not Detected
PFDA 3/13/2025 <3.00 ppt 3.00 ppt Not Detected
PFOA 3/13/2025 <4.00 ppt 4.00 ppt Not Detected
PFOS 3/13/2025 <4.00 ppt 4.00 ppt Not Detected
PFNA 3/13/2025 <4.00 ppt 4.00 ppt Not Detected
PFHxS 3/13/2025 <3.00 ppt 3.00 ppt Not Detected
PFHpA 3/13/2025 <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 Santa Ana Westside.

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 063503118 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 6 — Tribal Water Systems Drinking Water Authority

EPA Region 6 — 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 06 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
2020 Arsenic MCL 17 SDWIS / 063503118 / 1005
2011 Coliform (TCR) MR 11 SDWIS / 063503118 / 3100
2010 Arsenic MR 3 SDWIS / 063503118 / 1005
2010 Endothall MR 2 SDWIS / 063503118 / 2033
2010 Dalapon MR 2 SDWIS / 063503118 / 2031
2010 Di(2-ethylhexyl) adipate MR 2 SDWIS / 063503118 / 2035
2010 Di(2-ethylhexyl) phthalate MR 2 SDWIS / 063503118 / 2039
2010 Picloram MR 2 SDWIS / 063503118 / 2040
2010 Dinoseb MR 2 SDWIS / 063503118 / 2041
2010 LASSO MR 2 SDWIS / 063503118 / 2051
2010 2,4-D MR 2 SDWIS / 063503118 / 2105
2010 2,4,5-TP MR 2 SDWIS / 063503118 / 2110
2010 Benzo(a)pyrene MR 2 SDWIS / 063503118 / 2306
2010 1,2-DIBROMO-3-CHLOROPROPANE MR 2 SDWIS / 063503118 / 2931
2010 Chlordane MR 2 SDWIS / 063503118 / 2959

How Santa Ana Westside Compares

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

Metric Santa Ana Westside EPA Region 6 — Tribal Water Systems avg Federal benchmark
Total violations 147 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 19 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 10,691 - 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 6 — 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 Santa Ana Westside water safe to drink? ▼
Santa Ana Westside (PWS ID: 063503118) has 147 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 10,691 people using Groundwater sources.
How many people does Santa Ana Westside serve? ▼
Santa Ana Westside serves 10,691 people in Santa Ana Pueblo, EPA Region 6 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 33 service connections.
What type of violations does Santa Ana Westside have? ▼
Santa Ana Westside has 147 total violations: 19 health-based violations (MCL exceedances or treatment failures), 116 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Santa Ana Westside water? ▼
No. Santa Ana Westside was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Santa Ana Westside use? ▼
Santa Ana Westside 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. 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.