Mahopac Water Quality
New York
According to EPA SDWIS, Mahopac, New York is served by 18 community water systems covering about 10,190 people. The same extract lists 76 health-based violation records, most recently coded 1017 in 2024. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Mahopac, New York is delivered through 18 EPA-regulated community water systems serving an estimated 10,190 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 76 violation records across the 18 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 3 distinct EPA contaminant codes: Chloride, Iron, Surface Water Treatment Rule. 1 TRI-reporting industrial facility is also located within the city limits.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the New York drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| CARMEL WD 2 | 5,000 | 0 | Clean |
| CARMEL WD 3 | 1,350 | 8 | Health |
| CARMEL WD 8 | 1,000 | 1 | Health |
| CARMEL WD 4 | 450 | 20 | Health |
| CARMEL WD 9 | 400 | 0 | Clean |
| CARMEL WD 14 | 400 | 0 | Clean |
| CARMEL WD 7 | 300 | 0 | Clean |
| CARMEL WD 12 | 300 | 0 | Clean |
| YORKVIEW ESTATES W S INC | 200 | 0 | Clean |
| CARMEL WD 6-SHELL VALLEY | 200 | 0 | Clean |
| CARMEL WD 5 | 150 | 0 | Clean |
| CARPENTER TRAILER PARK | 100 | 0 | Clean |
| WHITE SAIL CONDOMINIUM W.S. | 85 | 30 | Health |
| WATER CLUB CONDOMINIUMS W.S. | 75 | 4 | Health |
| SHORE ESTATES OWNERS ASSOC INC | 60 | 0 | Clean |
| MIDDLEBRANCH APTS | 50 | 9 | Health |
| CARMEL WD 6-TOMAHAWK CREEK | 50 | 0 | Clean |
| LAKE PROPERTIES | 20 | 4 | Health |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2024-01-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2024-01-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2024-01-01 |
| CARMEL WD 4 | Chloride | 2023-11-14 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-10-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-10-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-10-01 |
| CARMEL WD 4 | Chloride | 2023-10-01 |
| CARMEL WD 4 | Chloride | 2023-10-01 |
| CARMEL WD 4 | Chloride | 2023-10-01 |
| WATER CLUB CONDOMINIUMS W.S. | Chloride | 2023-10-01 |
| WATER CLUB CONDOMINIUMS W.S. | Chloride | 2023-10-01 |
| MIDDLEBRANCH APTS | Chloride | 2023-10-01 |
| MIDDLEBRANCH APTS | Chloride | 2023-10-01 |
| MIDDLEBRANCH APTS | Chloride | 2023-10-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-07-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-07-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-07-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-07-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-07-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-07-01 |
| MIDDLEBRANCH APTS | Chloride | 2023-07-01 |
| MIDDLEBRANCH APTS | Chloride | 2023-07-01 |
| MIDDLEBRANCH APTS | Chloride | 2023-07-01 |
| CARMEL WD 3 | Chloride | 2023-07-01 |
| CARMEL WD 3 | Chloride | 2023-07-01 |
| CARMEL WD 3 | Chloride | 2023-07-01 |
| CARMEL WD 3 | Chloride | 2023-07-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-04-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-04-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-04-01 |
| CARMEL WD 4 | Chloride | 2023-04-01 |
| CARMEL WD 4 | Chloride | 2023-04-01 |
| CARMEL WD 4 | Chloride | 2023-04-01 |
| CARMEL WD 4 | Chloride | 2023-04-01 |
| CARMEL WD 3 | Chloride | 2023-04-01 |
| CARMEL WD 3 | Chloride | 2023-04-01 |
| CARMEL WD 3 | Chloride | 2023-04-01 |
| CARMEL WD 3 | Chloride | 2023-04-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-01-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-01-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-01-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-01-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-01-01 |
| WHITE SAIL CONDOMINIUM W.S. | Chloride | 2023-01-01 |
| CARMEL WD 4 | Chloride | 2023-01-01 |
| CARMEL WD 4 | Chloride | 2023-01-01 |
| CARMEL WD 4 | Chloride | 2023-01-01 |
| CARMEL WD 4 | Chloride | 2023-01-01 |
| LAKE PROPERTIES | Iron | 2023-01-01 |
What are Mahopac's health-based records for?
Mahopac's health-based violation records carry 3 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Chloride | 71 | 5 |
| Iron | 4 | 1 |
| Surface Water Treatment Rule | 1 | 1 |
TRI Facilities in Mahopac
| Facility | Total Releases |
|---|---|
| Enviro Waste | 294 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Mahopac, New York? ▼
How many water violations does Mahopac have in this EPA extract? ▼
What contaminants were found in Mahopac water? ▼
How many water systems serve Mahopac? ▼
Where does Mahopac get its drinking water? ▼
Are there pollution sources near Mahopac? ▼
How does Mahopac compare in New York?
Of the 841 New York places with at least one community water system on file, Mahopac ranks #10 by number of systems (18).
Either side of it: Ithaca (19), Brewster (18), Wappingers Falls (18), Fishkill (16)
About This Data
Figures here are the current EPA SDWIS extract joined to the 18 community water systems whose service area lists Mahopac, ranked against the 841 New York places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.