Community Water System · PWS MI0001770
Deerfield
Operator location Deerfield, Michigan - 75% of 600 violations are health-based (upper-third health share (> 23%)); surface water source; 943 served per SDWIS.
- 943
- People served (this PWS)
- 600
- EPA violations (this PWS)
- 448
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Deerfield standing, high SDWIS violation third
75% of 600 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 75% is upper-third health share (> 23%). Population rank #20,520 of 29,740 among systems serving 500+.
The verdict
Deerfield sits in the upper third of the sitemap cohort by violation count (600), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (943; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 75% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #20,520 of 29,740
- Population · /systems
- #679 of 1,375
- Population · MI
- 600
- Total EPA violations on record
- 75%
- 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
- 375
- County
- Lenawee
- School/Daycare
- No
- MCL Violations
- 316
- Monitoring Violations
- 145
- Treatment Tech Violations
- 132
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Total Haloacetic Acids (HAA5) | MCL | 153 | 2011 |
| TTHM | MCL | 141 | 2011 |
| Long Term 2 Enhanced Surface Water Treatment Rule | TT | 128 | 2017 |
| Nitrate | MCL | 15 | 2004 |
| Endrin | MR | 8 | 2022 |
| BHC-GAMMA | MR | 8 | 2022 |
| Methoxychlor | MR | 8 | 2022 |
| Simazine | MR | 8 | 2022 |
| Hexachlorocyclopentadiene | MR | 8 | 2022 |
| LASSO | MR | 8 | 2022 |
| Heptachlor | MR | 8 | 2022 |
| Heptachlor epoxide | MR | 8 | 2022 |
| Total Polychlorinated Biphenyls (PCB) | MR | 8 | 2022 |
| Chlordane | MR | 8 | 2022 |
| Interim Enhanced Surface Water Treatment Rule | MR | 8 | 2017 |
| HEXACHLOROBENZENE | MR | 8 | 2022 |
| Atrazine | MR | 8 | 2022 |
| Toxaphene | MR | 8 | 2022 |
| TTHM | MR | 7 | 2016 |
| Coliform (TCR) | MCL | 4 | 2008 |
| Nitrate | MR | 4 | 2008 |
| Di(2-ethylhexyl) phthalate | MR | 4 | 2022 |
| Benzo(a)pyrene | MR | 4 | 2022 |
| Di(2-ethylhexyl) adipate | MR | 4 | 2022 |
| Interim Enhanced Surface Water Treatment Rule | TT | 4 | 2017 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2014 |
| ETHYLENE DIBROMIDE | MR | 3 | 2024 |
| Revised Total Coliform Rule | RPT | 3 | 2018 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 3 | 2024 |
| ETHYLENE DIBROMIDE | MCL | 3 | 2025 |
Violation Count vs. the National Corpus
Deerfield has 600 recorded EPA violations, 97% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 3% carry more. 75% of this system's own violations are health-based (448 of 600), and it ranks #20,520 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)
600 Higher than most more violations than 97% 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 Deerfield
448 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for MI0001770.
Sources: EPA SDWIS · Michigan EGLE, Drinking Water and Environmental Health Division
Nationwide peers
600 violations · 943 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 Deerfield
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.