Community Water System · PWS IL1130350
Colfax
Operator location Colfax, Illinois - smaller served population (≤ 999) at 989 people served; 104 SDWIS violations on record from groundwater sources.
- 989
- People served (this PWS) Smaller third of systems
- 104
- EPA violations (this PWS) Upper third of systems
- 9
- Health-based (this PWS) Middle third by health-based share
- Untested
- UCMR5 (this PWS) No UCMR5 result
Colfax standing, high SDWIS violation third
989 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 9% is middle-third health share (≤ 23%). Population rank #19,962 of 29,740 among systems serving 500+.
The verdict
Colfax sits in the upper third of the sitemap cohort by violation count (104), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (989; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 9% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #19,962 of 29,740
- Population · /systems
- #888 of 1,310
- Population · IL
- 104
- Total EPA violations on record
- 9%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 492
- County
- McLean
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 76
- Treatment Tech Violations
- 9
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 19 | 2015 |
| Lead and Copper Rule | MR | 19 | 2013 |
| Chlorine | MR | 16 | 2015 |
| Lead and Copper Rule | TT | 9 | 2009 |
| Xylenes, Total | MR | 8 | 2013 |
| Public Notice | Other | 8 | 2014 |
| Ethylbenzene | MR | 7 | 2011 |
| Consumer Confidence Rule | Other | 5 | 2025 |
| Vinyl chloride | MR | 4 | 2011 |
| Combined Radium (-226 and -228) | MR | 2 | 2008 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1977 |
Violation Count vs. the National Corpus
Colfax has 104 recorded EPA violations, 74% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 26% carry more. 9% of this system's own violations are health-based (9 of 104), and it ranks #19,962 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)
104 Around the middle fewer violations than 26% 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
How many violations vs. how serious, among peer systems
Colfax plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.
Violation volume vs. health-based share
Population served record for Colfax
EPA SDWIS lists 989 people served and 492 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · Illinois EPA, Bureau of Water
Nationwide peers
104 violations · 989 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
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 Colfax
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Illinois compares on the same EPA violation measures. Illinois 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.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.