Community Water System · PWS CA4700503
Callahan Water District
Operator location Callahan, California - smaller served population (≤ 999) at 70 people served; 46 SDWIS violations on record from surface water sources.
- 70
- People served (this PWS)
- 46
- EPA violations (this PWS)
- 5
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Callahan Water District standing, mid SDWIS violation third
70 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 11% is middle-third health share (≤ 23%).
The verdict
Callahan Water District lands in the middle third by violation volume (46), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (70; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 11% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 46
- Total EPA violations on record
- 11%
- Health-based (MCL / treatment failure)
- 70
- 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
- 33
- County
- Siskiyou
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 14
- Treatment Tech Violations
- 5
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 6 | 2013 |
| Long Term 2 Enhanced Surface Water Treatment Rule | TT | 3 | 2016 |
| Surface Water Treatment Rule | TT | 2 | 1993 |
| Consumer Confidence Rule | Other | 2 | 2018 |
| Gross Alpha, Excl. Radon and U | MR | 2 | 1981 |
| Toxaphene | MR | 1 | 1981 |
| BHC-GAMMA | MR | 1 | 1981 |
| Methoxychlor | MR | 1 | 1981 |
| Endrin | MR | 1 | 1981 |
| 2,4,5-TP | MR | 1 | 1981 |
| 2,4-D | MR | 1 | 1981 |
Violation Count vs. the National Corpus
Callahan Water District has 46 recorded EPA violations, 54% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 45% carry more. 11% of this system's own violations are health-based (5 of 46), 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)
46 Around the middle fewer violations than 45% 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 Callahan Water District
EPA SDWIS lists 70 people served and 33 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
46 violations · 70 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 Callahan Water District
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.