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Non-Transient Non-Community Water System · PWS CA5700508

Old Sugar Mill Winery

Clarksburg, California 95612 - drinking water served from groundwater sources to 50 people, tracked in EPA SDWIS and UCMR5.

50
People served
225
EPA violations
81
Health-based
Untested
UCMR5 result

The verdict

EPA records 225 drinking-water violations at Old Sugar Mill Winery, 36% of them health-based - above the California per-system average.

225
Total EPA violations on record
36%
Health-based (MCL / treatment failure)
50
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Old Sugar Mill Winery

Old Sugar Mill Winery is a private-owned non-transient non-community water system that delivers drinking water to 50 residents in Clarksburg, California (Yolo County) through 6 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 225 total violations for this system , of which 81 (36%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 141 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 Coliform (TCR), recorded in 58 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, 231 of 694 UCMR5-tested systems have reported PFAS detections (33.3%).

Old Sugar Mill Winery's 225 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
225
Health-Based Violations
81
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
6
County
Yolo
School/Daycare
No
MCL Violations
80
Monitoring Violations
141
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 58 2016
Arsenic MCL 22 2023
Arsenic MR 5 2020
Lead and Copper Rule MR 5 2021
Xylenes, Total MR 2 2017
DICHLOROMETHANE MR 2 2017
Vinyl chloride MR 2 2017
1,1,1-Trichloroethane MR 2 2017
Carbon tetrachloride MR 2 2017
1,2-Dichloropropane MR 2 2017
Tetrachloroethylene MR 2 2017
Benzene MR 2 2017
Toluene MR 2 2017
Ethylbenzene MR 2 2017
Styrene MR 2 2017
BHC-GAMMA MR 2 2017
Dalapon MR 2 2017
Endothall MR 2 2017
Glyphosate MR 2 2017
Di(2-ethylhexyl) adipate MR 2 2017
Simazine MR 2 2017
Di(2-ethylhexyl) phthalate MR 2 2017
Hexachlorocyclopentadiene MR 2 2017
Atrazine MR 2 2017
2,3,7,8-TCDD MR 2 2017
Heptachlor MR 2 2017
Heptachlor epoxide MR 2 2017
2,4,5-TP MR 2 2017
Benzo(a)pyrene MR 2 2017
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2017

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 Old Sugar Mill Winery.

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 CA5700508 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 Old Sugar Mill Winery 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 LEAD AND COPPER RULE REVISIONS RPT 1 SDWIS / CA5700508 / 5200
2024 LEAD AND COPPER RULE REVISIONS TT 1 SDWIS / CA5700508 / 5200
2023 Arsenic MCL 22 SDWIS / CA5700508 / 1005
2021 Lead and Copper Rule MR 5 SDWIS / CA5700508 / 5000
2021 CYANIDE MR 1 SDWIS / CA5700508 / 1024
2020 Arsenic MR 5 SDWIS / CA5700508 / 1005
2017 Xylenes, Total MR 2 SDWIS / CA5700508 / 2955
2017 DICHLOROMETHANE MR 2 SDWIS / CA5700508 / 2964
2017 Vinyl chloride MR 2 SDWIS / CA5700508 / 2976
2017 1,1,1-Trichloroethane MR 2 SDWIS / CA5700508 / 2981
2017 Carbon tetrachloride MR 2 SDWIS / CA5700508 / 2982
2017 1,2-Dichloropropane MR 2 SDWIS / CA5700508 / 2983
2017 Tetrachloroethylene MR 2 SDWIS / CA5700508 / 2987
2017 Benzene MR 2 SDWIS / CA5700508 / 2990
2017 Toluene MR 2 SDWIS / CA5700508 / 2991

How Old Sugar Mill Winery Compares

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

Metric Old Sugar Mill Winery California avg Federal benchmark
Total violations 225 21.1 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 81 8.8 Indicates a contaminant exceeded a federal MCL
PFAS detection None 33.3% 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 Old Sugar Mill Winery water safe to drink? ▼
Old Sugar Mill Winery (PWS ID: CA5700508) has 225 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 Old Sugar Mill Winery serve? ▼
Old Sugar Mill Winery serves 50 people in Clarksburg, California. It is a Private-owned system using Groundwater water sources with 6 service connections.
What type of violations does Old Sugar Mill Winery have? ▼
Old Sugar Mill Winery has 225 total violations: 81 health-based violations (MCL exceedances or treatment failures), 141 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Old Sugar Mill Winery water? ▼
No PFAS testing data is available for Old Sugar Mill Winery under the EPA's UCMR5 monitoring program.
What water source does Old Sugar Mill Winery use? ▼
Old Sugar Mill Winery uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.