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PHOENIX LAKE ESTATES CC MWC

PWS ID: CA5510026 · SONORA, California 95370

PHOENIX LAKE ESTATES CC MWC serves 1,168 people in SONORA, California using Groundwater water sources. It has 47 recorded EPA violations, including 13 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: PHOENIX LAKE ESTATES CC MWC

PHOENIX LAKE ESTATES CC MWC is a private-owned community water system that delivers drinking water to 1,168 residents in SONORA, California (Tuolumne County) through 358 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 47 total violations for this system , of which 13 (28%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 33 monitoring and reporting violations are on file. The most recent violation on record dates to 2006.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 13 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. PHOENIX LAKE ESTATES CC MWC's 47 violations sit above the California average. Statewide, 447 of 694 UCMR5-tested systems have reported PFAS detections (64.4%). 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
1,168
Total Violations
47
Health-Based Violations
13
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
358
County
Tuolumne
School/Daycare
No
MCL Violations
13
Monitoring Violations
33
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 13 2001
Nitrate MR 8 2005
Lead and Copper Rule MR 5 2006
Antimony, Total MR 2 2002
Barium MR 2 2002
Beryllium, Total MR 2 2002
Cadmium MR 2 2002
Mercury MR 2 2002
Selenium MR 2 2002
Nickel MR 2 2002
Arsenic MR 2 2002
Thallium, Total MR 2 2002
Chromium MR 2 2002

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 PHOENIX LAKE ESTATES CC MWC.

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 CA5510026 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 PHOENIX LAKE ESTATES CC MWC 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
2006 Lead and Copper Rule MR 5 SDWIS / CA5510026 / 5000
2005 Nitrate MR 8 SDWIS / CA5510026 / 1040
2002 Antimony, Total MR 2 SDWIS / CA5510026 / 1074
2002 Barium MR 2 SDWIS / CA5510026 / 1010
2002 Beryllium, Total MR 2 SDWIS / CA5510026 / 1075
2002 Cadmium MR 2 SDWIS / CA5510026 / 1015
2002 Mercury MR 2 SDWIS / CA5510026 / 1035
2002 Selenium MR 2 SDWIS / CA5510026 / 1045
2002 Nickel MR 2 SDWIS / CA5510026 / 1036
2002 Arsenic MR 2 SDWIS / CA5510026 / 1005
2002 Thallium, Total MR 2 SDWIS / CA5510026 / 1085
2002 Chromium MR 2 SDWIS / CA5510026 / 1020
2001 Coliform (TCR) MCL 13 SDWIS / CA5510026 / 3100

How PHOENIX LAKE ESTATES CC MWC Compares

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

Metric PHOENIX LAKE ESTATES CC MWC California avg Federal benchmark
Total violations 47 21.1 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 13 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 1,168 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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is PHOENIX LAKE ESTATES CC MWC water safe to drink? ▼
PHOENIX LAKE ESTATES CC MWC (PWS ID: CA5510026) has 47 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,168 people using Groundwater sources.
How many people does PHOENIX LAKE ESTATES CC MWC serve? ▼
PHOENIX LAKE ESTATES CC MWC serves 1,168 people in SONORA, California. It is a Private-owned system using Groundwater water sources with 358 service connections.
What type of violations does PHOENIX LAKE ESTATES CC MWC have? ▼
PHOENIX LAKE ESTATES CC MWC has 47 total violations: 13 health-based violations (MCL exceedances or treatment failures), 33 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in PHOENIX LAKE ESTATES CC MWC water? ▼
No PFAS testing data is available for PHOENIX LAKE ESTATES CC MWC under the EPA's UCMR5 monitoring program.
What water source does PHOENIX LAKE ESTATES CC MWC use? ▼
PHOENIX LAKE ESTATES CC MWC 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.

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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.

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