Water quality for ZIP code 10543
ZIP 10543 covers Mamaroneck and Scarsdale in Westchester County, New York, one of 74 ZIP codes in the county. 273 active public water systems serve the county; 93 had an EPA violation in the past three years.
Most likely your provider
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in Westchester County
91 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Larchmont Village Larchmont (v) |
6,485 | 0 | 2.1 mi | |
| Westchester County WD #1 |
0 | 0 | 3.3 mi | |
| Scarsdale Water Department |
21,649 | 1 | 3.4 mi | |
| Veolia Water New York, Inc. Rd-1 Ardsley (v), Bronxville (v), Dobbs Ferry (v) and 6 more |
146,732 | 1 | 4.0 mi | |
| Veolia Water New York, Inc. Rd-2 Port Chester (v), Rye (t), Rye Brook (v) |
57,301 | 1 | 4.1 mi | |
| White Plains City White Plains (c) |
59,559 | 0 | 4.7 mi | |
| Mount Vernon Water Department Mount Vernon (c) |
73,893 | 0 | 5.6 mi | |
| Yonkers City Yonkers (c) |
211,569 | 0 | 6.7 mi | |
| Greenburgh Consolidated WD #1 Greenburgh (t) |
43,312 | 0 | 7.0 mi | |
| North Castle Water District #1 North Castle (t) |
2,500 | 2 | 7.8 mi | |
| Elmsford Village Elmsford (v) |
5,293 | 0 | 8.1 mi | |
| Irvington Water Supply Irvington (v) |
6,631 | 0 | 8.6 mi | |
| Westchester County WD #3 Greenburgh (t) |
6,000 | 1 | 9.8 mi | |
| Tarrytown Water Supply Tarrytown (v) |
11,000 | 1 | 10.1 mi | |
| Kensico Water District Mount Pleasant (t) |
17,917 | 0 | 10.9 mi | |
| Sleepy Hollow (village) Mount Pleasant (t) |
9,870 | 0 | 11.7 mi | |
| Bear Ridge Lake Water District Mount Pleasant (t) |
518 | 0 | 11.8 mi | |
| Applehill Farm Water District Mount Pleasant (t) |
209 | 0 | 11.8 mi | |
| Pleasant Ridge Water District Mount Pleasant (t) |
95 | 0 | 11.8 mi | |
| Meadowbrook Water District Mount Pleasant (t) |
91 | 0 | 11.8 mi | |
| Mill River Water District Mount Pleasant (t) |
74 | 0 | 11.8 mi | |
| Pleasantville Road Water District Mount Pleasant (t) |
56 | 0 | 11.8 mi | |
| Pleasantville Extension #1 Mount Pleasant (t) |
49 | 0 | 11.8 mi | |
| North Castle Water District #5 North Castle (t) |
225 | 0 | 11.9 mi | |
| North Castle Water District #4 North Castle (t) |
1,225 | 1 | 12.0 mi |
Non-community systems in Westchester County (181: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Cranberry Lake North Castle (t) |
250 | 1 | 0 | |
|
Citigroup Exec. Planning Center |
40 | 3 | 0 | |
|
Swiss RE of America |
800 | 1 | 0 | |
|
1 Byram Brook Pl. North Castle (t) |
50 | 1 | 0 | |
|
2 Byram Brook Pl. North Castle (t) |
50 | 1 | 0 | |
|
Moderne Barn North Castle (t) |
101 | 0 | 0 | |
|
Armonk Fire District #2 North Castle (t) |
60 | 2 | 0 | |
|
Church of St. Patrick North Castle (t) |
200 | 0 | 0 | |
|
Armonk Alliance Church North Castle (t) |
208 | 0 | 0 | |
|
Breezemont Day Camp North Castle (t) |
550 | 0 | 0 | |
|
Congregation Bnai Israel North Castle (t) |
30 | 0 | 0 | |
|
North Castle Water District #8 North Castle (t) |
101 | 0 | 0 | |
|
28 Kaysal Court Office Bldg. North Castle (t) |
50 | 1 | 0 | |
|
Nicks Corner Market/pirmar Food Corp. North Castle (t) |
25 | 1 | 0 | |
|
Byram Hills High School North Castle (t) |
973 | 0 | 0 | |
|
North Castle Pool &tennis Club North Castle (t) |
400 | 0 | 0 | |
|
Armonk Tennis Club North Castle (t) |
200 | 0 | 0 | |
|
Grand Slam Banksville North Castle (t) |
100 | 1 | 0 | |
|
Finch Country Store |
25 | 1 | 0 | |
|
LA Cremaillere North Castle (t) |
100 | 1 | 0 | |
|
Edith Macy Camp of Tomorrow Ossining (t) |
100 | 0 | 0 | |
|
Church of Jesus Christ Lds Ossining (t) |
300 | 0 | 0 | |
|
Kingdom Hall of Jehovahs Wit Ossining (t) |
125 | 1 | 0 | |
|
Fox Lane High & Middle Schools Mount Kisco (v) |
3,000 | 0 | 0 | |
|
Bedford Rest Area Nys RT 684 Bedford (t) |
1,000 | 2 | 0 | |
|
Northern Westchester 103-105 Bedford (t) |
160 | 0 | 0 | |
|
Unitarian Universalist of N. West Bedford (t) |
50 | 1 | 0 | |
|
Chestnut Ridge Racquet Club Bedford (t) |
220 | 1 | 0 | |
|
Temple Shaaray Tefila Bedford (t) |
75 | 0 | 0 | |
|
Chabad of Bedford Bedford (t) |
120 | 1 | 0 | |
|
325 West Patent Road Mount Kisco (v) |
365 | 0 | 0 | |
|
Bedford Village Plaza Bedford (t) |
100 | 1 | 0 | |
|
Pound Ridge Golf Club Pound Ridge (t) |
101 | 0 | 0 | |
|
Travelers Restaurant Yorktown (t) |
150 | 1 | 0 | |
|
West Patent Elementary School Bedford (t) |
400 | 0 | 0 | |
|
Country Childrens Center Yorktown Yorktown (t) |
79 | 1 | 0 | |
|
Teatown Lake Reservation Cortlandt (t), Yorktown (t) |
100 | 1 | 0 | |
|
Rippowam Cisqua School Bedford Bedford (t) |
425 | 1 | 0 | |
|
Quade Bldg/ Dinardo Rest. Pound Ridge (t) |
50 | 0 | 0 | |
|
Metzger Building Pound Ridge (t) |
100 | 3 | 0 | |
|
Barnwell Building Pound Ridge (t) |
25 | 4 | 0 | |
|
Bonne Building Pound Ridge (t) |
101 | 0 | 0 | |
|
Albano Electric Pound Ridge (t) |
102 | 0 | 0 | |
|
73 Westchester , LLC Pound Ridge (t) |
101 | 1 | 0 | |
|
Saint Matthews Episcopal Church Bedford (t) |
100 | 0 | 0 | |
|
Pound Ridge Town House Pound Ridge (t) |
75 | 0 | 0 | |
|
Trinity Corners Shopping Cent. Pound Ridge (t) |
100 | 0 | 0 | |
|
Bedford Community Church Bedford (t) |
250 | 0 | 0 | |
|
Bedford Post Restaurant Bedford (t) |
100 | 0 | 0 | |
|
Glen Arbor Golf Club Bedford (t) |
101 | 0 | 0 |
About this data
Water systems are matched to Westchester County, the county this ZIP code lies in, nearest to the ZIP code's centre 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. Distances are measured to the centre of the service area EPA publishes for the system or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau county subdivision files or the centre of the first town EPA lists the system as serving, from Census Bureau place files.
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.