NY / Watertown
NY · Tap water records
Watertown tap water, in plain English
Here is what the EPA's own data shows about tap water in Watertown. According to EPA SDWIS data retrieved June 2026, Watertown is served by 14 active community water systems, together reported to serve about 43,351 people.
As of June 2026, EPA records show 307 violations across the community water system(s) serving Watertown, going back to the earliest EPA record. 162 of these are classified by the EPA as health-based (a contaminant recorded above the limit the EPA tracks); the rest are monitoring or reporting violations. Each is listed by system below, with its status.
What the EPA has on record, by system
Watertown City
27,861 served · surface water · PWSID NY2202346 - Health-based Interim Enhanced Surface Water Treatment Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in December 2025. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
- Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 17 times between January 2017 and January 2023. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
- Health-based Total Haloacetic Acids (HAA5): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 4 times between July 2017 and July 2020. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
Leray Town Wd 1, 2, 4
7,140 served · groundwater · PWSID NY2221206 As of June 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.
Sackets Harbor Village
2,200 served · surface water · PWSID NY2202343 As of June 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.
Pamelia Town Wd 4 & 5
1,857 served · surface water · PWSID NY2230066 - Health-based Total Haloacetic Acids (HAA5): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 17 times between October 2020 and July 2022. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
- Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 28 times between July 2016 and July 2021. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
- Monitoring Gross Alpha, Incl. Radon and U: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 8 times between January 2016 and October 2016. All have since returned to compliance, per EPA records.
- Monitoring Combined Uranium: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 8 times between January 2016 and October 2016. All have since returned to compliance, per EPA records.
- Monitoring Combined Radium (-226 and -228): a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 8 times between January 2016 and October 2016. All have since returned to compliance, per EPA records.
- Monitoring Radium-226: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 8 times between January 2016 and October 2016. All have since returned to compliance, per EPA records.
- Monitoring Radium-228: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 8 times between January 2016 and October 2016. All have since returned to compliance, per EPA records.
- Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in July 2005. All have since returned to compliance, per EPA records.
Watertown Town Wd 3 & 4 & 5
750 served · surface water · PWSID NY2202352 - Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 11 times between October 2017 and October 2022. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
- Health-based Total Haloacetic Acids (HAA5): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in October 2021. The EPA record lists a level of 62.8 UG/L; the limit (MCL) is 60 UG/L. EPA records do not show all of these as returned to compliance.
Hounsfield Wd 2
725 served · surface water · PWSID NY2230094 - Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 29 times between July 2014 and October 2024. The EPA record lists a level of 131.2 UG/L; the limit (MCL) is 80 UG/L. EPA records do not show all of these as returned to compliance.
- Monitoring Revised Total Coliform Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 4 times between May 2025 and September 2025. EPA records do not show all of these as returned to compliance.
- Monitoring Coliform (TCR): a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in July 2015. All have since returned to compliance, per EPA records.
Harrisville (Diana Wd 1)
700 served · groundwater · PWSID NY2402364 - Monitoring LEAD AND COPPER RULE REVISIONS: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times in October 2024. All have since returned to compliance, per EPA records.
Watertown Town Wd 1 & 2
600 served · surface water · PWSID NY2202348 - Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 4 times between January 2022 and July 2022. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
- Health-based Total Haloacetic Acids (HAA5): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in October 2021. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
Hounsfield Wd 1, 5
480 served · surface water · PWSID NY2221870 - Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 20 times between October 2015 and July 2018. The EPA record lists a level of 96.1 UG/L; the limit (MCL) is 80 UG/L. All have since returned to compliance, per EPA records.
- Monitoring Revised Total Coliform Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 4 times between May 2025 and September 2025. EPA records do not show all of these as returned to compliance.
- Monitoring Coliform (TCR): a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times in July 2015. All have since returned to compliance, per EPA records.
Leray Town Wd 3
480 served · groundwater · PWSID NY2230105 As of June 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.
Hounsfield Wd 3 (Wescott Beach)
270 served · surface water · PWSID NY2230115 - Monitoring Revised Total Coliform Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 4 times between May 2025 and September 2025. EPA records do not show all of these as returned to compliance.
- Monitoring Coliform (TCR): a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in July 2015. All have since returned to compliance, per EPA records.
Pamelia Town Wd #2
150 served · surface water · PWSID NY2230075 - Health-based Total Haloacetic Acids (HAA5): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 5 times between July 2021 and April 2022. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
- Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 10 times between April 2016 and April 2020. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.
Evergreen Hills Mhp
78 served · groundwater · PWSID NY3218204 - Monitoring contaminant code null: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 62 times between February 2016 and November 2025. EPA records do not show all of these as returned to compliance.
- Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in July 1994. All have since returned to compliance, per EPA records.
Waddington Estates Mhp (Gu)
60 served · surface water · PWSID NY3201466 - Health-based PERFLUOROCTANE SULFONIC ACID (PFOS): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 12 times between July 2022 and October 2025. The EPA record lists a level of 17.9 NG/L; the limit (MCL) is 10 NG/L. EPA records do not show all of these as returned to compliance.
- Health-based Surface Water Treatment Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in November 2006. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.
- Health-based Stage 1 Disinfectants and Disinfection Byproducts Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in January 2006. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.
- Monitoring contaminant code null: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 9 times between October 2014 and July 2024. EPA records do not show all of these as returned to compliance.
- Monitoring Consumer Confidence Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 8 times between October 1999 and September 2012. EPA records do not show all of these as returned to compliance.
- Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 6 times between January 1994 and October 2011. All have since returned to compliance, per EPA records.
What this means
A health-based violation means a contaminant was recorded above the limit the EPA tracks for it. A monitoring or reporting violation means a required test or report was late or missed — not that a contaminant was measured above a limit. “Returned to compliance” means the EPA recorded the issue as resolved.
This page summarizes the EPA's own records and does not assess whether your water is safe to drink. For the most current details, you can verify every record directly with the EPA, and contact your water system with questions.
Source: U.S. EPA Envirofacts SDWIS, retrieved June 2026. Records cover the EPA's full reporting history for these systems. Verify at EPA ECHO.