Community Water System · PWS ID5420010
Castleford City Of
Operator location Castleford, Idaho - 43% of 47 violations are health-based (upper-third health share (> 23%)); groundwater source; 275 served per SDWIS.
- 275
- People served (this PWS)
- 47
- EPA violations (this PWS)
- 20
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Castleford City Of standing, mid SDWIS violation third
43% of 47 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 43% is upper-third health share (> 23%).
The verdict
Castleford City Of lands in the middle third by violation volume (47), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (275; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 43% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 47
- Total EPA violations on record
- 43%
- Health-based (MCL / treatment failure)
- 275
- 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
- 112
- County
- Twin Falls
- School/Daycare
- No
- MCL Violations
- 20
- Monitoring Violations
- 26
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 15 | 2009 |
| Chlorine | MR | 10 | 2019 |
| Coliform (TCR) | MCL | 5 | 2006 |
| Nitrate | MR | 4 | 2009 |
| Coliform (TCR) | MR | 4 | 2008 |
| Revised Total Coliform Rule | MON | 3 | 2019 |
| Arsenic | MR | 2 | 2008 |
| Lead and Copper Rule | MR | 2 | 2022 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 2008 |
Violation Count vs. the National Corpus
Castleford City Of has 47 recorded EPA violations, 55% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 45% carry more. 43% of this system's own violations are health-based (20 of 47), 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)
47 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
Health-based violations on Castleford City Of
20 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for ID5420010.
Sources: EPA SDWIS
Nationwide peers
47 violations · 275 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 Castleford City Of
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Idaho compares on the same EPA violation measures. Idaho 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.