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States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 090600148

Santa Rosa Rancheria

Lemoore, EPA Region 9 — Tribal Water Systems 93245 - drinking water served from groundwater sources to 1,000 people, tracked in EPA SDWIS and UCMR5.

1,000
People served
306
EPA violations
70
Health-based
Untested
UCMR5 result

The verdict

EPA records 306 drinking-water violations at Santa Rosa Rancheria, 23% of them health-based.

306
Total EPA violations on record
23%
Health-based (MCL / treatment failure)
1,000
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Santa Rosa Rancheria

Santa Rosa Rancheria is a native american-owned community water system that delivers drinking water to 1,000 residents in Lemoore, EPA Region 9 — Tribal Water Systems through 251 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 306 total violations for this system , of which 70 (23%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 86 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is TTHM, recorded in 70 violations (MCL, health-based). 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
1,000
Total Violations
306
Health-Based Violations
70
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
251
School/Daycare
No
MCL Violations
70
Monitoring Violations
86
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 70 2014
Coliform (TCR) MR 14 2015
Revised Total Coliform Rule MON 14 2025
TTHM MR 11 2024
Total Haloacetic Acids (HAA5) MR 10 2024
Chlorine MR 9 2025
Public Notice Other 7 2025
Consumer Confidence Rule Other 6 2023
Nitrate MR 3 2004
Lead and Copper Rule MR 3 2000
Carbofuran MR 2 2004
2,4-D MR 2 2004
Pentachlorophenol MR 2 2004
2,4,5-TP MR 2 2004
CYANIDE MR 1 2004
Diquat MR 1 2004
Endothall MR 1 2004
Glyphosate MR 1 2004
OXAMYL MR 1 2004
Picloram MR 1 2004
Dinoseb MR 1 2004
2,3,7,8-TCDD MR 1 2004
Benzo(a)pyrene MR 1 2004
Gross Alpha, Excl. Radon and U MR 1 2004
Radium-226 MR 1 1999
Di(2-ethylhexyl) adipate MR 1 2004
Dalapon MR 1 2004
Di(2-ethylhexyl) phthalate 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 Santa Rosa Rancheria.

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 090600148 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
2025 Revised Total Coliform Rule MON 14 SDWIS / 090600148 / 8000
2025 Chlorine MR 9 SDWIS / 090600148 / 0999
2025 Public Notice Other 7 SDWIS / 090600148 / 7500
2024 TTHM MR 11 SDWIS / 090600148 / 2950
2024 Total Haloacetic Acids (HAA5) MR 10 SDWIS / 090600148 / 2456
2023 Consumer Confidence Rule Other 6 SDWIS / 090600148 / 7000
2015 Coliform (TCR) MR 14 SDWIS / 090600148 / 3100
2014 TTHM MCL 70 SDWIS / 090600148 / 2950
2004 Nitrate MR 3 SDWIS / 090600148 / 1040
2004 Carbofuran MR 2 SDWIS / 090600148 / 2046
2004 2,4-D MR 2 SDWIS / 090600148 / 2105
2004 Pentachlorophenol MR 2 SDWIS / 090600148 / 2326
2004 2,4,5-TP MR 2 SDWIS / 090600148 / 2110
2004 CYANIDE MR 1 SDWIS / 090600148 / 1024
2004 Diquat MR 1 SDWIS / 090600148 / 2032

How Santa Rosa Rancheria Compares

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

Metric Santa Rosa Rancheria EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 306 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 70 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,000 - 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 Santa Rosa Rancheria water safe to drink? ▼
Santa Rosa Rancheria (PWS ID: 090600148) has 306 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,000 people using Groundwater sources.
How many people does Santa Rosa Rancheria serve? ▼
Santa Rosa Rancheria serves 1,000 people in Lemoore, EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 251 service connections.
What type of violations does Santa Rosa Rancheria have? ▼
Santa Rosa Rancheria has 306 total violations: 70 health-based violations (MCL exceedances or treatment failures), 86 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Santa Rosa Rancheria water? ▼
No PFAS testing data is available for Santa Rosa Rancheria under the EPA's UCMR5 monitoring program.
What water source does Santa Rosa Rancheria use? ▼
Santa Rosa Rancheria 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.