Community Water System · PWS CA0800532
Big Rock C.s.d.
Operator location Crescent City, California - smaller served population (≤ 999) at 650 people served; 48 SDWIS violations on record from groundwater sources.
- 650
- People served (this PWS)
- 48
- EPA violations (this PWS)
- 2
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Big Rock C.s.d. standing, mid SDWIS violation third
650 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 4% is middle-third health share (≤ 23%). Population rank #25,193 of 29,740 among systems serving 500+.
The verdict
Big Rock C.s.d. lands in the middle third by violation volume (48), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (650; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 4% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #25,193 of 29,740
- Population · /systems
- #1,446 of 1,701
- Population · CA
- 48
- Total EPA violations on record
- 4%
- Health-based (MCL / treatment failure)
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
- 116
- County
- Del Norte
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 19
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 8 | 2004 |
| Lead and Copper Rule | MR | 3 | 2019 |
| Surface Water Treatment Rule | TT | 2 | 1993 |
| Gross Alpha, Excl. Radon and U | MR | 2 | 1981 |
| 2,4,5-TP | MR | 1 | 1981 |
| 2,4-D | MR | 1 | 1981 |
| Endrin | MR | 1 | 1981 |
| Toxaphene | MR | 1 | 1981 |
| BHC-GAMMA | MR | 1 | 1981 |
| Methoxychlor | MR | 1 | 1981 |
Violation Count vs. the National Corpus
Big Rock C.s.d. has 48 recorded EPA violations, 55% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 44% carry more. 4% of this system's own violations are health-based (2 of 48), and it ranks #25,193 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
48 Around the middle fewer violations than 44% 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 Big Rock C.s.d.
EPA SDWIS lists 650 people served and 116 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
48 violations · 650 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.
Cross-state systems with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Big Rock C.s.d.
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.