Public water system record
Southwest Harbor Water & Sewer District
Serves an area of Hancock County, ME that includes Southwest Harbor · 2,480 people served
Federal records show 7 health-based violations and 23 monitoring/reporting issues for Southwest Harbor Water & Sewer District in the last ten years. The most serious issue in this window was a resolved Total Trihalomethanes (TTHMs) violation.
System profile
Source water
Surface water
ZIP
04679
EPA system ID
ME0091490
- Health-based violations, last 10 years
- 7
- Resolved
- 7
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 23
Key facts
- Southwest Harbor Water & Sewer District draws water from 1 surface water intake.
- Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.16 mg/L, federal limit 0.08 mg/L (2 times the limit), 2019.
- Most recent formal enforcement: compliance order (no penalty) by Maine, September 2020.
- Record on file since 1993, with 53 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 133 unknown out of 992 service lines.
Check whether Southwest Harbor Water & Sewer District serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.0965 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Apr 1, 2020 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.092 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Jan 1, 2020 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.112 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
220 | Oct 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.16 mg/L, federal limit 0.08 mg/L (2 times the limit)
|
220 | Jul 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.0914 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jan 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
220 | Oct 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
220 | Apr 1, 2018 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Public Notice
OTHER
|
Oct 19, 2023 | Active |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2022 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Dec 30, 2021 | Resolved |
|
Public Notice
OTHER
|
May 2, 2020 | Resolved |
|
Public Notice
OTHER
|
Apr 5, 2020 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Apr 1, 2020 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Apr 1, 2020 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Oct 1, 2019 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jul 1, 2019 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jul 1, 2019 | Resolved |
|
Public Notice
OTHER
|
Apr 27, 2019 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Apr 1, 2019 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Apr 1, 2019 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jul 1, 2018 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jul 1, 2018 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Apr 1, 2018 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Apr 1, 2018 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Oct 1, 2017 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Oct 1, 2017 | Resolved |
|
Public Notice
OTHER
|
May 5, 2017 | Resolved |
|
Asbestos
Monitoring and reporting
|
Jan 1, 2012 | Resolved |
Full record since 1993
EPA's records for Southwest Harbor Water & Sewer District go back to 1993. Before October 19, 2016 they list 53 health-based violations (53 resolved) and 11 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 16 | 5 |
| 2000s | 31 | 1 |
| 2010 to October 18, 2016 | 6 | 5 |
| October 19, 2016 to 2019 | 5 | 13 |
| 2020s | 2 | 9 |
Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began April 2011, Resolved.
Show all 53 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 82.5 µg/L, federal limit 80 µg/L (at or just above the limit)
|
Apr 1, 2011 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 83.3 µg/L, federal limit 80 µg/L (at or just above the limit)
|
Jan 1, 2011 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.0834 mg/L, federal limit 0.08 mg/L (at or just above the limit)
|
Oct 1, 2010 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.0896 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Jul 1, 2010 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.11 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
Apr 1, 2010 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.124 mg/L, federal limit 0.08 mg/L (1.6 times the limit)
|
Jan 1, 2010 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.139 mg/L, federal limit 0.08 mg/L (1.7 times the limit)
|
Oct 1, 2009 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.136 mg/L, federal limit 0.08 mg/L (1.7 times the limit)
|
Jul 1, 2009 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.134 mg/L, federal limit 0.08 mg/L (1.7 times the limit)
|
Apr 1, 2009 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.128 mg/L, federal limit 0.08 mg/L (1.6 times the limit)
|
Jan 1, 2009 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Oct 1, 2008 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Jul 1, 2008 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Apr 1, 2008 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Jan 1, 2008 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 103.4 µg/L, federal limit 80 µg/L (1.3 times the limit)
|
Oct 1, 2007 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.068 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
Jul 1, 2007 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Jul 1, 2007 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
|
Apr 1, 2007 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Apr 1, 2007 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.071 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
Jan 1, 2007 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.094 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Jan 1, 2007 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.075 mg/L, federal limit 0.06 mg/L (1.3 times the limit)
|
Oct 1, 2006 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.093 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Oct 1, 2006 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.074 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
Jul 1, 2006 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.129 mg/L, federal limit 0.08 mg/L (1.6 times the limit)
|
Jul 1, 2006 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.128 mg/L, federal limit 0.08 mg/L (1.6 times the limit)
|
Apr 1, 2006 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1312 mg/L, federal limit 0.08 mg/L (1.6 times the limit)
|
Jan 1, 2006 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.13475 mg/L, federal limit 0.08 mg/L (1.7 times the limit)
|
Oct 1, 2005 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1115 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
Jul 1, 2005 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.0925 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Apr 1, 2005 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.07375 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
Jan 1, 2005 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.111 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
Jan 1, 2005 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
|
Oct 1, 2004 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Oct 1, 2004 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.119 mg/L, federal limit 0.08 mg/L (1.5 times the limit)
|
Jul 1, 2004 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.093 mg/L, federal limit 0.06 mg/L (1.6 times the limit)
|
Jul 1, 2004 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Feb 1, 2003 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Dec 1, 1998 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Nov 1, 1998 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Oct 10, 1998 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Oct 1, 1998 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Sep 1, 1998 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Aug 1, 1998 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jul 1, 1998 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 1998 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
May 1, 1998 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Apr 1, 1998 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Mar 1, 1998 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Feb 1, 1998 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jan 1, 1998 | Resolved |
3 older violations are not listed here. EPA ECHO has the complete list.
Enforcement actions
Maine regulators took 9 formal enforcement actions against Southwest Harbor Water & Sewer District between 2006 and 2020, filed as 10 records in EPA's data. The most recent was a compliance order (no penalty) in September 2020.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Sep 29, 2020 | Maine | Compliance order (no penalty) | 9 violations (6 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5), Public Notice |
| Apr 18, 2012 | Maine | Signed compliance agreement | 36 violations (36 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5) |
| Apr 6, 2012 | Maine | Compliance order (no penalty) | 53 violations (53 health-based): Total Trihalomethanes (TTHMs), Surface Water Treatment Rule, Haloacetic Acids (HAA5), Total Coliform |
| Nov 3, 2008 | Maine | Signed compliance agreement | 34 violations (33 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5), Consumer Confidence Rule |
| Oct 21, 2008 | Maine | Compliance order (no penalty) | 11 violations (11 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
| Nov 29, 2007 | Maine | Signed compliance agreement | 11 violations (11 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
| Aug 17, 2007 | Maine | Signed compliance agreement | 26 violations (25 health-based): Haloacetic Acids (HAA5), Consumer Confidence Rule, Total Trihalomethanes (TTHMs) |
| Mar 30, 2007 | Maine | Compliance order (no penalty) | 9 violations (9 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
| Dec 5, 2006 | Maine | Compliance order (no penalty) | 6 violations (6 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
What the violations mean
Total Trihalomethanes (TTHMs)
7 incidentsDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Where the water comes from
Southwest Harbor Water & Sewer District draws water from 1 surface water intake.
Annual water quality report
Southwest Harbor Water & Sewer District must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Maine.
Certified drinking water labs by state EPA guidance for private wells