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States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 090605013

Pechanga

Temecula, EPA Region 9 — Tribal Water Systems 92593 - drinking water served from surface water sources to 29,100 people, tracked in EPA SDWIS and UCMR5.

29,100
People served
130
EPA violations
9
Health-based
3 PFAS
UCMR5 result

The verdict

EPA records 130 drinking-water violations at Pechanga, 7% of them health-based, and UCMR5 testing detected 3 PFAS compounds.

130
Total EPA violations on record
7%
Health-based (MCL / treatment failure)
29,100
People served by this system
3
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Pechanga

Pechanga is a native american-owned community water system that delivers drinking water to 29,100 residents in Temecula, EPA Region 9 — Tribal Water Systems through 328 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 130 total violations for this system , of which 9 (7%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 68 monitoring and reporting violations are on file. The most recent violation on record dates to 2005.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 22 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 3 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 8.9 ppt (parts per trillion). PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

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.

PFAS Detected

3 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
29,100
Total Violations
130
Health-Based Violations
9
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Native American
Connections
328
School/Daycare
No
MCL Violations
9
Monitoring Violations
68
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 22 2004
Consumer Confidence Rule Other 16 2005
Coliform (TCR) MCL 9 2003
Nitrate MR 4 2003
2,3,7,8-TCDD MR 3 2004
Glyphosate MR 2 2001
Lead and Copper Rule MR 2 1996
Benzene MR 2 2004
Asbestos MR 1 1996
BHC-GAMMA MR 1 1998
Toxaphene MR 1 1998
Diquat MR 1 2004
Endothall MR 1 2001
Hexachlorocyclopentadiene MR 1 1998
cis-1,2-Dichloroethylene MR 1 1998
Total Polychlorinated Biphenyls (PCB) MR 1 1998
Xylenes, Total MR 1 1998
DICHLOROMETHANE MR 1 1998
1,2-Dichloroethane MR 1 1998
1,1,1-Trichloroethane MR 1 1998
Carbon tetrachloride MR 1 1998
Toluene MR 1 1998
Styrene MR 1 1998
Radium-226 MR 1 2001
Tetrachloroethylene MR 1 1998
1,1-Dichloroethylene MR 1 1998
Trichloroethylene MR 1 1998
Chlordane MR 1 1998
CHLOROBENZENE MR 1 1998
Vinyl chloride MR 1 1998

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 6 of 348 samples detected PFAS.

Contaminant Date Result MRL Status
11Cl-PF3OUdS 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 8/23/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
PFUnA 8/23/2023 <2.00 ppt 2.00 ppt Not Detected
PFBA 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 8/23/2023 <20.00 ppt 20.00 ppt Not Detected
PFDoA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
PFNA 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
NEtFOSAA 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 8/23/2023 <7.00 ppt 7.00 ppt Not Detected
PFTA 8/23/2023 <8.00 ppt 8.00 ppt Not Detected
NMeFOSAA 8/23/2023 <6.00 ppt 6.00 ppt Not Detected
PFOS 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
PFMPA 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 8/23/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 8/23/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 8/23/2023 <5.00 ppt 5.00 ppt Not Detected
PFOA 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
PFTrDA 8/23/2023 <7.00 ppt 7.00 ppt Not Detected
PFHxS 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 8/23/2023 <4.00 ppt 4.00 ppt Not Detected
4:2 FTS 8/23/2023 <3.00 ppt 3.00 ppt Not Detected
NEtFOSAA 8/23/2023 <5.00 ppt 5.00 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 Pechanga.

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 090605013 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
2005 Consumer Confidence Rule Other 16 SDWIS / 090605013 / 7000
2004 Coliform (TCR) MR 22 SDWIS / 090605013 / 3100
2004 2,3,7,8-TCDD MR 3 SDWIS / 090605013 / 2063
2004 Benzene MR 2 SDWIS / 090605013 / 2990
2004 Diquat MR 1 SDWIS / 090605013 / 2032
2003 Coliform (TCR) MCL 9 SDWIS / 090605013 / 3100
2003 Nitrate MR 4 SDWIS / 090605013 / 1040
2001 Glyphosate MR 2 SDWIS / 090605013 / 2034
2001 Endothall MR 1 SDWIS / 090605013 / 2033
2001 Radium-226 MR 1 SDWIS / 090605013 / 4020
1998 BHC-GAMMA MR 1 SDWIS / 090605013 / 2010
1998 Toxaphene MR 1 SDWIS / 090605013 / 2020
1998 Hexachlorocyclopentadiene MR 1 SDWIS / 090605013 / 2042
1998 cis-1,2-Dichloroethylene MR 1 SDWIS / 090605013 / 2380
1998 Total Polychlorinated Biphenyls (PCB) MR 1 SDWIS / 090605013 / 2383

How Pechanga Compares

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

Metric Pechanga EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 130 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 9 - Indicates a contaminant exceeded a federal MCL
PFAS detection 3 compounds - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 29,100 - 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 Pechanga water safe to drink? ▼
Pechanga (PWS ID: 090605013) has 130 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 3 PFAS compounds found. This system serves 29,100 people using Surface Water sources.
How many people does Pechanga serve? ▼
Pechanga serves 29,100 people in Temecula, EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Surface Water water sources with 328 service connections.
What type of violations does Pechanga have? ▼
Pechanga has 130 total violations: 9 health-based violations (MCL exceedances or treatment failures), 68 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Pechanga water? ▼
Yes. UCMR5 testing detected 3 PFAS compounds in Pechanga's water supply: PFPeA, PFBS, PFHxA. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Pechanga use? ▼
Pechanga uses Surface Water 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.