Riverdale City Of, ND
Lead detected, under the action levels
Latest 90th-percentile lead: 1.22 ppb (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. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
About Riverdale City Of
Riverdale City Of serves about 205 people through 176 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 Mclean County, North Dakota. EPA system ID: ND2800825; phone on file: 701-654-7636. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2022 (1.33 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Riverdale City Of is 1.33 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.22 ppb |
| 2022 | 1.33 ppb |
| 2019 | 0.87 ppb |
| 2016 | 1.32 ppb |
Against other North Dakota systems
Of the 300 North Dakota systems with a lead result, the median latest reading is 0.91 ppb; 3 are over 15 ppb right now and 20 have gone over at some point. Riverdale City Of's 1.22 ppb sits at the 57th percentile in North Dakota and the 59th nationally (higher means more lead).
Other water systems in Mclean County
11 other systems share Mclean County; 6 of them have a higher latest lead result than Riverdale City Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Garrison Rural Water District | 1,805 | 0 (not detected) |
| Mclean-Sheridan Water District-System 1 | 1,800 | 1.07 ppb |
| Garrison City Of | 1,453 | 2.12 ppb |
| Washburn City Of | 1,246 | 5.08 ppb |
| Underwood City Of | 778 | 2.6 ppb |
| Turtle Lake City Of | 581 | 4.16 ppb |
| Mclean-Sheridan Water District-System 3 | 400 | 2.22 ppb |
| Mclean-Sheridan Water District-System 2 | 390 | 0.78 ppb |
| Max City Of | 334 | 0 (not detected) |
| Mercer City Of | 94 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Riverdale, ND may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Riverdale City Of 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. The action level is dropping - the 10 ppb rule from 2027.