Community Water System · PWS NY5503377
Marlborough Water District
Operator location Milton, New York - 50% of 86 violations are health-based (upper-third health share (> 23%)); surface water source; 3,248 served per SDWIS.
- 3,248
- People served (this PWS)
- 86
- EPA violations (this PWS)
- 43
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Marlborough Water District standing, high SDWIS violation third
50% of 86 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 50% is upper-third health share (> 23%). Population rank #10,058 of 29,740 among systems serving 500+.
The verdict
Marlborough Water District sits in the upper third of the sitemap cohort by violation count (86), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 3,248 (mid served population (≤ 3,309)). Health-based share is 50% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #10,058 of 29,740
- Population · /systems
- #322 of 1,204
- Population · NY
- 86
- Total EPA violations on record
- 50%
- 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
- 1,140
- County
- Ulster
- School/Daycare
- No
- MCL Violations
- 9
- Monitoring Violations
- 43
- Treatment Tech Violations
- 34
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | TT | 31 | 2000 |
| TTHM | MR | 14 | 2023 |
| Total Haloacetic Acids (HAA5) | MR | 14 | 2023 |
| Total Haloacetic Acids (HAA5) | MCL | 9 | 2009 |
| Lead and Copper Rule | MR | 8 | 2008 |
| Coliform (TCR) | MR | 4 | 2013 |
| Interim Enhanced Surface Water Treatment Rule | TT | 3 | 2011 |
| Surface Water Treatment Rule | MR | 3 | 2008 |
Violation Count vs. the National Corpus
Marlborough Water District has 86 recorded EPA violations, 70% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 30% carry more. 50% of this system's own violations are health-based (43 of 86), and it ranks #10,058 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)
86 Around the middle fewer violations than 30% 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 Marlborough Water District
43 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NY5503377.
Sources: EPA SDWIS · New York State Department of Health, Public Water Systems
Nationwide peers
86 violations · 3,248 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 near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Marlborough Water District
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in New York compares on the same EPA violation measures. New York 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.