Superior Water System, IA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2023-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Superior Water System at a glance
Superior Water System serves about 135 people through 72 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Dickinson County, Iowa. EPA system ID: IA3073001; phone on file: 712-858-4528. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Superior Water System is 4 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 4 ppb |
How Superior Water System compares
Of the 1,066 Iowa systems with a lead result, the median latest reading is 1.4 ppb; 4 are over 15 ppb right now and 36 have gone over at some point. Superior Water System's reported as 0 (not detected) sits at the 7th percentile in Iowa and the 12th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
9 other systems share Dickinson County; 7 of them have a higher latest lead result than Superior Water System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Spirit Lake Waterworks | 6,167 | 1 ppb |
| Milford Municipal Utilities | 3,431 | 2 ppb |
| Lake Park Municipal Utilities | 1,167 | 4 ppb |
| Arnolds Park Water Department | 1,113 | 2 ppb |
| Okoboji Water Supply | 776 | 1 ppb |
| Wahpeton Water Supply | 408 | 0 (not detected) |
| Terril Municipal Waterworks | 334 | 1 ppb |
| West Okoboji | 308 | 4 ppb |
| Central Water System | 25 | - |
Next steps for Superior, IA
Look up your address in Superior Water System's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Superior Water System whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. The lead result guide covers how utilities pick the homes they sample. Small systems behave differently: why small systems go over more often.