PlainWater
States → California

Community Water System · PWS CA4400631

Las Cumbres Mutual Water Co

Los Gatos, California 95033 - drinking water served from surface water sources to 402 people, tracked in EPA SDWIS and UCMR5.

402
People served
249
EPA violations
215
Health-based
Untested
UCMR5 result

The verdict

EPA records 249 drinking-water violations at Las Cumbres Mutual Water Co, 86% of them health-based - above the California per-system average.

249
Total EPA violations on record
86%
Health-based (MCL / treatment failure)
402
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Las Cumbres Mutual Water Co

Las Cumbres Mutual Water Co is a private-owned community water system that delivers drinking water to 402 residents in Los Gatos, California (Santa Cruz County) through 125 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 249 total violations for this system , of which 215 (86%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 25 monitoring and reporting violations are on file. The most recent violation on record dates to 2018.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, recorded in 215 violations (TT, 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%).

Las Cumbres Mutual Water Co's 249 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
402
Total Violations
249
Health-Based Violations
215
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Private
Connections
125
County
Santa Cruz
School/Daycare
No
MCL Violations
0
Monitoring Violations
25
Treatment Tech Violations
215

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Surface Water Treatment Rule TT 215 2016
Coliform (TCR) MR 14 2015
E. COLI MR 8 2018
Gross Alpha, Excl. Radon and U MR 2 1981
Lead and Copper Rule MR 1 1993

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 Las Cumbres Mutual Water Co.

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 CA4400631 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 Las Cumbres Mutual Water Co 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
2018 E. COLI MR 8 SDWIS / CA4400631 / 3014
2016 Surface Water Treatment Rule TT 215 SDWIS / CA4400631 / 0200
2015 Coliform (TCR) MR 14 SDWIS / CA4400631 / 3100
1993 Lead and Copper Rule MR 1 SDWIS / CA4400631 / 5000
1981 Gross Alpha, Excl. Radon and U MR 2 SDWIS / CA4400631 / 4000

How Las Cumbres Mutual Water Co Compares

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

Metric Las Cumbres Mutual Water Co California avg Federal benchmark
Total violations 249 21.1 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 215 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 402 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 Las Cumbres Mutual Water Co water safe to drink? ▼
Las Cumbres Mutual Water Co (PWS ID: CA4400631) has 249 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 402 people using Surface Water sources.
How many people does Las Cumbres Mutual Water Co serve? ▼
Las Cumbres Mutual Water Co serves 402 people in Los Gatos, California. It is a Private-owned system using Surface Water water sources with 125 service connections.
What type of violations does Las Cumbres Mutual Water Co have? ▼
Las Cumbres Mutual Water Co has 249 total violations: 215 health-based violations (MCL exceedances or treatment failures), 25 monitoring/reporting violations, and 215 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Las Cumbres Mutual Water Co water? ▼
No PFAS testing data is available for Las Cumbres Mutual Water Co under the EPA's UCMR5 monitoring program.
What water source does Las Cumbres Mutual Water Co use? ▼
Las Cumbres Mutual Water Co 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. 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.