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Community Water System · PWS CA1510046

Lost Hills Utility District

Lost Hills, California 93249 - drinking water served from groundwater sources to 2,370 people, tracked in EPA SDWIS and UCMR5.

2,370
People served
53
EPA violations
21
Health-based
Untested
UCMR5 result

The verdict

EPA records 53 drinking-water violations at Lost Hills Utility District, 40% of them health-based - above the California per-system average.

53
Total EPA violations on record
40%
Health-based (MCL / treatment failure)
2,370
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Lost Hills Utility District

Lost Hills Utility District is a private-owned community water system that delivers drinking water to 2,370 residents in Lost Hills, California (Kern County) through 450 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 53 total violations for this system , of which 21 (40%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 32 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 16 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.

Across California, EPA tracks 7,249 public water systems serving 42,404,883 people, with 153,308 cumulative violations and 63,983 health-based violations on record. About 89% of systems in the state carry at least one violation, and state-wide the average per system is 21.1 violations. Statewide, 447 of 694 UCMR5-tested systems have reported PFAS detections (64.4%).

Lost Hills Utility District's 53 violations sit above the California average.

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
2,370
Total Violations
53
Health-Based Violations
21
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
450
County
Kern
School/Daycare
No
MCL Violations
21
Monitoring Violations
32
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 16 2011
Coliform (TCR) MR 10 2015
Lead and Copper Rule MR 10 2023
Arsenic MCL 5 2008
Nitrate MR 4 2004
Total Haloacetic Acids (HAA5) MR 3 2009
TTHM MR 3 2009
Arsenic MR 2 2006

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 Lost Hills Utility District.

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 CA1510046 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

California Drinking Water Authority

California State Water Resources Control Board, Division of Drinking Water is the primacy agency that licenses and inspects Lost Hills Utility District under EPA-delegated authority.

Open CA regulator portal

Source: California State Water Resources Control Board, Division of Drinking Water

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
2023 Lead and Copper Rule MR 10 SDWIS / CA1510046 / 5000
2015 Coliform (TCR) MR 10 SDWIS / CA1510046 / 3100
2011 Coliform (TCR) MCL 16 SDWIS / CA1510046 / 3100
2009 Total Haloacetic Acids (HAA5) MR 3 SDWIS / CA1510046 / 2456
2009 TTHM MR 3 SDWIS / CA1510046 / 2950
2008 Arsenic MCL 5 SDWIS / CA1510046 / 1005
2006 Arsenic MR 2 SDWIS / CA1510046 / 1005
2004 Nitrate MR 4 SDWIS / CA1510046 / 1040

How Lost Hills Utility District Compares

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

Metric Lost Hills Utility District California avg Federal benchmark
Total violations 53 21.1 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 21 8.8 Indicates a contaminant exceeded a federal MCL
PFAS detection None 64.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 2,370 5,850 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 7,249 regulated public water systems in California.

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 Lost Hills Utility District water safe to drink? ▼
Lost Hills Utility District (PWS ID: CA1510046) has 53 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,370 people using Groundwater sources.
How many people does Lost Hills Utility District serve? ▼
Lost Hills Utility District serves 2,370 people in Lost Hills, California. It is a Private-owned system using Groundwater water sources with 450 service connections.
What type of violations does Lost Hills Utility District have? ▼
Lost Hills Utility District has 53 total violations: 21 health-based violations (MCL exceedances or treatment failures), 32 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Lost Hills Utility District water? ▼
No PFAS testing data is available for Lost Hills Utility District under the EPA's UCMR5 monitoring program.
What water source does Lost Hills Utility District use? ▼
Lost Hills Utility District 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.