Water quality for ZIP code 99171
ZIP 99171 covers St. John in Whitman County, Washington, one of 20 ZIP codes in the county. 34 active public water systems serve the county; 16 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Whitman County
18 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Endicott Water Dept |
488 | 1 | 11.8 mi | |
| Malden Water Dept |
215 | 0 | 12.3 mi | |
| Lamont Water System |
136 | 0 | 13.8 mi | |
| Rosalia Town of |
831 | 0 | 16.5 mi | |
| Steptoe Water/sewer District |
210 | 2 | 19.1 mi | |
| Oakesdale Town of |
492 | 0 | 19.4 mi | |
| Colfax Water Department City of |
3,507 | 2 | 20.0 mi | |
| Lacrosse Town of |
297 | 2 | 22.4 mi | |
| Garfield Water Department |
694 | 4 | 25.0 mi | |
| Albion Water Dept |
600 | 1 | 28.5 mi | |
| Farmington Water Dept |
165 | 0 | 28.6 mi | |
| Tekoa City of |
1,076 | 2 | 28.7 mi | |
| Palouse Water Dept City of |
1,298 | 0 | 30.3 mi | |
| Sunset Mobile Court |
51 | 0 | 32.7 mi | |
| Pullman Water Department City of |
31,315 | 3 | 34.3 mi | |
| Washington State University |
21,506 | 0 | 34.9 mi | |
| Colton Water Department |
632 | 1 | 44.3 mi | |
| Uniontown Water Works |
366 | 0 | 47.1 mi |
Non-community systems in Whitman County (15: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Horn School Rest Area |
557 | 1 | 0 | |
|
Palouse Empire Fairgrounds |
733 | 1 | 0 | |
|
Colfax Lds Church |
35 | 0 | 0 | |
|
Onecho Bible Church |
49 | 0 | 0 | |
|
Klemgard County Park |
157 | 0 | 0 | |
|
Kamiak Butte County Park |
201 | 1 | 0 | |
|
Boyer Park & Marina |
37 | 1 | 0 | |
|
Tula Young Hastings Farm Wsu |
40 | 2 | 0 | |
|
Wawawai County Park |
154 | 0 | 0 | |
|
Schad Holdings |
29 | 0 | 0 | |
|
Garrison Center |
60 | 0 | 0 | |
|
Wilma Port of |
108 | 0 | 0 | |
|
Evangelical Free Church |
404 | 0 | 0 | |
|
Project Cougar |
283 | 3 | 1 | |
|
Toyota of Pullman |
53 | 0 | 0 |
About this data
Water systems are matched to Whitman 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.
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 Washington 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.