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Community Water System · PWS CA4100551

Marchi Central Farm

Pescadero, California 94060 - drinking water served from groundwater sources to 50 people, tracked in EPA SDWIS and UCMR5.

50
People served
24
EPA violations
4
Health-based
Untested
UCMR5 result

The verdict

EPA records 24 drinking-water violations at Marchi Central Farm, 17% of them health-based - above the California per-system average.

24
Total EPA violations on record
17%
Health-based (MCL / treatment failure)
50
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Marchi Central Farm

Marchi Central Farm is a private-owned community water system that delivers drinking water to 50 residents in Pescadero, California (San Mateo County) through 10 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 24 total violations for this system , of which 4 (17%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 15 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 5 violations (MR). 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%).

Marchi Central Farm's 24 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
50
Total Violations
24
Health-Based Violations
4
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
10
County
San Mateo
School/Daycare
No
MCL Violations
4
Monitoring Violations
15
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 5 2003
Coliform (TCR) MR 4 2006
Antimony, Total MR 4 2023
Consumer Confidence Rule Other 2 2003
Coliform (TCR) MCL 2 2008
Antimony, Total Other 2 2021
E. COLI MR 2 2023
Antimony, Total MCL 2 2024

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 Marchi Central Farm.

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 CA4100551 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 Marchi Central Farm 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
2024 Antimony, Total MCL 2 SDWIS / CA4100551 / 1074
2023 Antimony, Total MR 4 SDWIS / CA4100551 / 1074
2023 E. COLI MR 2 SDWIS / CA4100551 / 3014
2021 Antimony, Total Other 2 SDWIS / CA4100551 / 1074
2008 Coliform (TCR) MCL 2 SDWIS / CA4100551 / 3100
2006 Coliform (TCR) MR 4 SDWIS / CA4100551 / 3100
2003 Lead and Copper Rule MR 5 SDWIS / CA4100551 / 5000
2003 Consumer Confidence Rule Other 2 SDWIS / CA4100551 / 7000

How Marchi Central Farm Compares

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

Metric Marchi Central Farm California avg Federal benchmark
Total violations 24 21.1 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 4 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 50 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 Marchi Central Farm water safe to drink? ▼
Marchi Central Farm (PWS ID: CA4100551) has 24 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 50 people using Groundwater sources.
How many people does Marchi Central Farm serve? ▼
Marchi Central Farm serves 50 people in Pescadero, California. It is a Private-owned system using Groundwater water sources with 10 service connections.
What type of violations does Marchi Central Farm have? ▼
Marchi Central Farm has 24 total violations: 4 health-based violations (MCL exceedances or treatment failures), 15 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Marchi Central Farm water? ▼
No PFAS testing data is available for Marchi Central Farm under the EPA's UCMR5 monitoring program.
What water source does Marchi Central Farm use? ▼
Marchi Central Farm 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.