Community Water System · PWS CA4900549
Sonoma County CSA 41-Freestone
Operator location Santa Rosa, California - 63% of 63 violations are health-based (upper-third health share (> 23%)); surface water source; 290 served per SDWIS.
- 290
- People served (this PWS)
- 63
- EPA violations (this PWS)
- 40
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Sonoma County CSA 41-Freestone standing, mid SDWIS violation third
63% of 63 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 63% is upper-third health share (> 23%).
The verdict
Sonoma County CSA 41-Freestone lands in the middle third by violation volume (63), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (290; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 63% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 63
- Total EPA violations on record
- 63%
- Health-based (MCL / treatment failure)
- 290
- 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
- Community
- Owner Type
- Local
- Connections
- 26
- County
- Sonoma
- School/Daycare
- No
- MCL Violations
- 36
- Monitoring Violations
- 13
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Total Haloacetic Acids (HAA5) | MCL | 21 | 2015 |
| TTHM | MCL | 15 | 2014 |
| Coliform (TCR) | MR | 8 | 2014 |
| Surface Water Treatment Rule | TT | 4 | 2009 |
| TTHM | MR | 2 | 2014 |
| Gross Alpha, Excl. Radon and U | MR | 2 | 1981 |
| Lead and Copper Rule | MR | 1 | 1993 |
Violation Count vs. the National Corpus
Sonoma County CSA 41-Freestone has 63 recorded EPA violations, 63% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 37% carry more. 63% of this system's own violations are health-based (40 of 63), 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)
63 Around the middle fewer violations than 37% 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
Health-based violations on Sonoma County CSA 41-Freestone
40 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for CA4900549.
Sources: EPA SDWIS · California State Water Resources Control Board, Division of Drinking Water
Nationwide peers
63 violations · 290 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with Sonoma County CSA 41-Freestone
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.