Community Water System · PWS ME0091490
Southwest Harbor Water & Sewer District
Operator location Southwest Harbor, Maine - 79% of 536 violations are health-based (upper-third health share (> 23%)); surface water source; 2,480 served per SDWIS.
- 2,480
- People served (this PWS)
- 536
- EPA violations (this PWS)
- 426
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Southwest Harbor Water & Sewer District standing, high SDWIS violation third
79% of 536 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 79% is upper-third health share (> 23%). Population rank #12,031 of 29,740 among systems serving 500+.
The verdict
Southwest Harbor Water & Sewer District sits in the upper third of the sitemap cohort by violation count (536), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 2,480 (mid served population (≤ 3,309)). Health-based share is 79% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #12,031 of 29,740
- Population · /systems
- #48 of 193
- Population · ME
- 536
- Total EPA violations on record
- 79%
- 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
- 992
- County
- Hancock
- School/Daycare
- No
- MCL Violations
- 383
- Monitoring Violations
- 84
- Treatment Tech Violations
- 43
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 283 | 2020 |
| Total Haloacetic Acids (HAA5) | MCL | 89 | 2007 |
| Surface Water Treatment Rule | TT | 43 | 1998 |
| Total Haloacetic Acids (HAA5) | MR | 36 | 2022 |
| TTHM | MR | 32 | 2022 |
| Coliform (TCR) | MCL | 11 | 2003 |
| Public Notice | Other | 10 | 2023 |
| Consumer Confidence Rule | Other | 9 | 2022 |
| Asbestos | MR | 4 | 2012 |
| Thallium, Total | MR | 2 | 1993 |
| Beryllium, Total | MR | 2 | 1993 |
| Antimony, Total | MR | 2 | 1993 |
| Nickel | MR | 2 | 1993 |
| Lead and Copper Rule | MR | 2 | 2021 |
| CYANIDE | MR | 2 | 1993 |
Violation Count vs. the National Corpus
Southwest Harbor Water & Sewer District has 536 recorded EPA violations, 96% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 4% carry more. 79% of this system's own violations are health-based (426 of 536), and it ranks #12,031 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)
536 Higher than most more violations than 96% 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 Southwest Harbor Water & Sewer District
426 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for ME0091490.
Sources: EPA SDWIS
Nationwide peers
536 violations · 2,480 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 Southwest Harbor Water & Sewer District
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Maine compares on the same EPA violation measures. Maine 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.