Community Water System · PWS CA3610701
Usmc Nebo (Barstow)
Operator location Barstow, California - lower-third violation load (≤ 21 violations) with 6 EPA violations; groundwater source; 1,126 served (PWS-level, not municipal population).
- 1,126
- People served (this PWS)
- 6
- EPA violations (this PWS)
- 1
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Usmc Nebo (Barstow) standing, low SDWIS violation third
6 EPA SDWIS violations on record - lower-third violation load (≤ 21 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 17% is middle-third health share (≤ 23%). Population rank #18,389 of 29,740 among systems serving 500+.
The verdict
Usmc Nebo (Barstow) is in the lower third by violation count (6; lower-third violation load (≤ 21 violations)). A low count does not mean the system is unmonitored - monitoring and reporting violations still appear in SDWIS. Population served is mid-pack at 1,126 (mid served population (≤ 3,309)). Health-based share is 17% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #18,389 of 29,740
- Population · /systems
- #1,110 of 1,701
- Population · CA
- 6
- Total EPA violations on record
- 17%
- 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
- Federal
- Connections
- 303
- County
- San Bernardino
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 2
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 2 | 2021 |
| Coliform (TCR) | MCL | 1 | 2010 |
Violation Count vs. the National Corpus
Usmc Nebo (Barstow) has 6 recorded EPA violations, 11% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 87% carry more. 17% of this system's own violations are health-based (1 of 6), and it ranks #18,389 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)
6 Among the lowest violation counts fewer violations than 87% 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
SDWIS compliance record for Usmc Nebo (Barstow)
6 violations on record for CA3610701; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS · California State Water Resources Control Board, Division of Drinking Water
Nationwide peers
6 violations · 1,126 served: nearest cross-state SDWIS matches.
Cross-state systems with similarly light violation ledgers
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Usmc Nebo
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.