Water quality for ZIP code 51331
ZIP 51331 covers Arnolds Park and West Okoboji in Dickinson County, Iowa, one of 7 ZIP codes in the county. 14 active public water systems serve the county; 4 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 Dickinson County
9 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Arnolds Park Water Department Arnolds Park |
1,113 | 0 | 0.4 mi | |
| Milford Municipal Utilities Milford |
3,431 | 1 | 1.9 mi | |
| Central Water System Okoboji |
25 | 1 | 1.9 mi | |
| Okoboji Water Supply Okoboji |
776 | 0 | 2.2 mi | |
| Wahpeton Water Supply Wahpeton |
408 | 0 | 2.7 mi | |
| Spirit Lake Waterworks Spirit Lake |
6,167 | 0 | 4.8 mi | |
| Terril Municipal Waterworks Terril |
334 | 1 | 8.9 mi | |
| Superior Water System Superior |
135 | 0 | 10.5 mi | |
| Lake Park Municipal Utilities Lake Park |
1,167 | 0 | 11.5 mi |
Non-community systems in Dickinson County (4: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Cedar Ridge Campground Arnolds Park |
250 | 0 | 0 | |
|
Treasure Village INC Milford |
70 | 0 | 0 | |
|
Kabeles Trading Post Spirit Lake |
104 | 3 | 0 | |
|
Anglers Bay Resort Spirit Lake |
110 | 0 | 0 |
About this data
Water systems are matched to Dickinson 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 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 Iowa 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.