Community Water System · PWS MI0001355
Chatham
Operator location Chatham, Michigan - 34% of 114 violations are health-based (upper-third health share (> 23%)); groundwater source; 300 served per SDWIS.
- 300
- People served (this PWS)
- 114
- EPA violations (this PWS)
- 39
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Chatham standing, high SDWIS violation third
34% of 114 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 34% is upper-third health share (> 23%).
The verdict
Chatham sits in the upper third of the sitemap cohort by violation count (114), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (300; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 34% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 114
- Total EPA violations on record
- 34%
- Health-based (MCL / treatment failure)
- 300
- 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
- 132
- County
- Alger
- School/Daycare
- No
- MCL Violations
- 37
- Monitoring Violations
- 71
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 29 | 2015 |
| Nitrate | MR | 9 | 2025 |
| Combined Radium (-226 and -228) | MCL | 8 | 2016 |
| Coliform (TCR) | MR | 7 | 2001 |
| CYANIDE | MR | 4 | 2010 |
| Lead and Copper Rule | MR | 2 | 2019 |
| LEAD AND COPPER RULE REVISIONS | RPT | 2 | 2024 |
| LEAD AND COPPER RULE REVISIONS | TT | 2 | 2024 |
| Heptachlor | MR | 1 | 2023 |
| cis-1,2-Dichloroethylene | MR | 1 | 2023 |
| HEXACHLOROBENZENE | MR | 1 | 2023 |
| o-Dichlorobenzene | MR | 1 | 2023 |
| trans-1,2-Dichloroethylene | MR | 1 | 2023 |
| 2,4-D | MR | 1 | 2023 |
| Pentachlorophenol | MR | 1 | 2023 |
| Aldicarb sulfone | MR | 1 | 2023 |
| 1,1,1-Trichloroethane | MR | 1 | 2023 |
| Radium-226 | MR | 1 | 2023 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 2023 |
| 1,2-Dichloroethane | MR | 1 | 2023 |
| Radium-228 | MR | 1 | 2023 |
| CHLOROBENZENE | MR | 1 | 2023 |
| 1,1-Dichloroethylene | MR | 1 | 2023 |
| Atrazine | MR | 1 | 2023 |
| Tetrachloroethylene | MR | 1 | 2023 |
| Aldicarb | MR | 1 | 2023 |
| Carbon tetrachloride | MR | 1 | 2023 |
| Endrin | MR | 1 | 2023 |
| Ethylbenzene | MR | 1 | 2023 |
| Hexachlorocyclopentadiene | MR | 1 | 2023 |
Violation Count vs. the National Corpus
Chatham has 114 recorded EPA violations, 76% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 24% carry more. 34% of this system's own violations are health-based (39 of 114), 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)
114 Higher than most more violations than 76% 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 Chatham
39 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for MI0001355.
Sources: EPA SDWIS · Michigan EGLE, Drinking Water and Environmental Health Division
Nationwide peers
114 violations · 300 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.
What to do with Chatham
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Michigan compares on the same EPA violation measures. Michigan 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.