Water quality for ZIP code 10542
ZIP 10542 covers Mahopac in Putnam County, New York, one of 9 ZIP codes in the county. 382 active public water systems serve the county; 41 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Putnam County
100 systems, largest first| System | Serves | Status | Rules violated, 3 yr |
|---|---|---|---|
| Cold Spring Village Cold Spring (v), Philipstown (t) |
2,666 | 1 | |
| Brewster Village Brewster (v), Southeast (t) |
2,162 | 0 | |
| Continental Village WD Philipstown (t) |
1,509 | 1 | |
| Mount Ebo WS Southeast (t) |
1,500 | 0 | |
| Brewster Heights Southeast (t) |
1,350 | 0 | |
| Carmel WD 3 Carmel (t) |
1,350 | 0 | |
| Watchtower Bible Tract Society Patterson (t) |
1,251 | 0 | |
| Carmel WD 8 Carmel (t) |
1,000 | 1 | |
| Hunters Glen Condominium WS Southeast (t) |
875 | 0 | |
| Mahopac Water CO Carmel (t) |
662 | 0 | |
| Reed Farm Condominiums W.s. Southeast (t) |
600 | 0 | |
| Blackberry Hill Southeast (t) |
500 | 0 | |
| Green Chimneys: Main Well Patterson (t) |
500 | 0 | |
| Vails Grove Cooperative Southeast (t) |
500 | 1 | |
| Fox Run Condominiums Patterson (t) |
475 | 0 | |
| Peaceable Hill Water District Southeast (t) |
475 | 0 | |
| Carmel WD 4 Carmel (t) |
450 | 1 | |
| Chateau Ridge Carmel (t) |
440 | 0 | |
| Hill Sparrow Master HOA Kent (t) |
432 | 0 | |
| Rainbow Water Carmel (t) |
432 | 0 | |
| Carmel WD 14 Carmel (t) |
400 | 0 | |
| Carmel WD 9 Carmel (t) |
400 | 1 | |
| Floradan Lodge Putnam Valley (t) |
400 | 0 | |
| Hillcrest Water District Southeast (t) |
400 | 0 | |
| Maple Hill Condominium W.s. Carmel (t) |
380 | 0 |
Non-community systems in Putnam County (281: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Mahopac School Complex (falls, Mms, Mhs) Carmel (t) |
3,200 | 1 | 0 | |
|
Chuang Yen Monastery Great Buddha Hall |
1,000 | 0 | 0 | |
|
Fahnestock Beach & Campground Putnam Valley (t) |
500 | 0 | 0 | |
|
Camp Wilbur Herrlich Patterson (t) |
400 | 0 | 0 | |
|
Carmel Recreation Carmel (t) |
400 | 0 | 0 | |
|
George Fisher Middle School Patterson (t) |
400 | 0 | 0 | |
|
Austin Road Elementary School Carmel (t) |
300 | 0 | 0 | |
|
Brewster Business Park Southeast (t) |
300 | 0 | 0 | |
|
Drewville Mart, Inc. Southeast (t) |
300 | 0 | 0 | |
|
Fulmar Road Elementary School Carmel (t) |
300 | 0 | 0 | |
|
Garrison Union Free School Philipstown (t) |
300 | 0 | 0 | |
|
Lakeview Elementary School Carmel (t) |
300 | 0 | 0 | |
|
Matthew Paterson Elementary School Patterson (t) |
300 | 0 | 0 | |
|
Putnam Valley Elementary Sch Putnam Valley (t) |
300 | 1 | 0 | |
|
Putnam Valley Professional Building Putnam Valley (t) |
300 | 0 | 0 | |
|
Ace Endico Company Southeast (t) |
200 | 0 | 0 | |
|
Putnam County Golf Course Carmel (t) |
200 | 0 | 0 | |
|
The Garrison Philipstown (t) |
200 | 0 | 0 | |
|
Towne Center Southeast (t) |
200 | 1 | 1 | |
|
Fahnestock Park Toec Putnam Valley (t) |
180 | 0 | 0 | |
|
German American Social Club Putnam Valley (t) |
180 | 0 | 0 | |
|
Four Brothers Pizza Restaurant Carmel (t) |
170 | 0 | 0 | |
|
M & J Wood Fire Pizza Carmel (t) |
150 | 0 | 0 | |
|
151 Bryant Pond Motel Putnam Valley (t) |
140 | 0 | 0 | |
|
Las Mananitas Brewster (v) |
130 | 0 | 0 | |
|
Rracis Brewster (v) |
125 | 0 | 0 | |
|
Tots N US Nursery School Patterson (t) |
125 | 0 | 0 | |
|
Kent Countryside Inn Kent (t) |
120 | 0 | 0 | |
|
Putnam County Park Lower Kent (t) |
105 | 0 | 0 | |
|
Brewster School Complex Southeast (t) |
100 | 0 | 0 | |
|
Clocktower Commons Southeast (t) |
100 | 0 | 0 | |
|
Cyo Blair Lodge |
100 | 0 | 0 | |
|
Holy Smoke Restaurant |
100 | 0 | 0 | |
|
Kent Elementary School Kent (t) |
100 | 0 | 0 | |
|
Kent Primary School Kent (t) |
100 | 0 | 0 | |
|
Kiwi Country Day Camp Summer System Carmel (t) |
100 | 0 | 0 | |
|
Lakeview Associates Shopping C Southeast (t) |
100 | 0 | 0 | |
|
Lincoln Logistics Brewster Southeast (t) |
100 | 0 | 0 | |
|
Manitou School Cold Spring (v) |
100 | 0 | 0 | |
|
Nicolas Italian Restaurant Cold Spring (v) |
100 | 0 | 0 | |
|
Zegarellis Tavern Patterson (t) |
100 | 0 | 0 | |
|
Garrison Restaurant & Pizza Philipstown (t) |
97 | 0 | 0 | |
|
Jaipore Royal Restaurant Brewster (v) |
90 | 0 | 0 | |
|
Lakeside Grille Carmel (t) |
90 | 0 | 0 | |
|
Thai Elephant 2 Patterson (t) |
90 | 0 | 0 | |
|
Lia Honda Brewster (v) |
88 | 0 | 0 | |
|
Tijuana Carmel (t) |
85 | 0 | 0 | |
|
Burger King # 1 Brewster (v) |
80 | 0 | 0 | |
|
Kiwi Country Day Camp Carmel (t) |
80 | 0 | 0 | |
|
Nyseg Ops & Trans, Brewster Southeast (t) |
80 | 0 | 0 |
About this data
Water systems are matched to Putnam County, the county this ZIP code lies in, largest first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The New York records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.