Non-Transient Non-Community Water System · PWS CA2000920
San Joaquin Wine Company
Operator location Madera, California - smaller served population (≤ 999) at 90 people served; 126 SDWIS violations on record from groundwater sources.
- 90
- People served (this PWS)
- 126
- EPA violations (this PWS)
- 28
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
San Joaquin Wine Company standing, high SDWIS violation third
90 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 22% is middle-third health share (≤ 23%).
The verdict
San Joaquin Wine Company sits in the upper third of the sitemap cohort by violation count (126), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (90; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 22% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 126
- Total EPA violations on record
- 22%
- Health-based (MCL / treatment failure)
- 90
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Private
- Connections
- 5
- County
- Madera
- School/Daycare
- No
- MCL Violations
- 28
- Monitoring Violations
- 88
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 17 | 2012 |
| Coliform (TCR) | MR | 15 | 2014 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MCL | 11 | 2023 |
| Nitrite | MR | 7 | 2022 |
| Consumer Confidence Rule | Other | 5 | 2011 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 5 | 2023 |
| Atrazine | MR | 3 | 2022 |
| Simazine | MR | 3 | 2022 |
| ETHYLENE DIBROMIDE | MR | 3 | 2022 |
| LASSO | MR | 3 | 2022 |
| Nitrate-Nitrite | MR | 2 | 2017 |
| Barium | MR | 2 | 2015 |
| Mercury | MR | 2 | 2015 |
| Selenium | MR | 2 | 2015 |
| Antimony, Total | MR | 2 | 2015 |
| Cadmium | MR | 2 | 2015 |
| Arsenic | MR | 2 | 2015 |
| Thallium, Total | MR | 2 | 2015 |
| Chromium | MR | 2 | 2015 |
| Beryllium, Total | MR | 2 | 2015 |
| Asbestos | MR | 2 | 2015 |
| Fluoride | MR | 2 | 2015 |
| Dalapon | MR | 1 | 2022 |
| Diquat | MR | 1 | 2022 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2022 |
| OXAMYL | MR | 1 | 2022 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 2022 |
| Picloram | MR | 1 | 2022 |
| Dinoseb | MR | 1 | 2022 |
| Hexachlorocyclopentadiene | MR | 1 | 2022 |
Violation Count vs. the National Corpus
San Joaquin Wine Company has 126 recorded EPA violations, 78% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 22% carry more. 22% of this system's own violations are health-based (28 of 126), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
126 Higher than most more violations than 78% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Population served record for San Joaquin Wine Company
EPA SDWIS lists 90 people served and 5 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · California State Water Resources Control Board, Division of Drinking Water
Nationwide peers
126 violations · 90 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with San Joaquin Wine Company
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in California compares on the same EPA violation measures. California systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.