Rock Lake City Of, ND
Lead detected, under the action levels
Latest 90th-percentile lead: 1.49 ppb (monitoring period 2022-2024). 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.
Rock Lake City Of at a glance
Rock Lake City Of serves about 94 people through 107 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 groundwater, in Towner County, North Dakota. EPA system ID: ND4800828. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
Against the period ending 2021 (1.15 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Rock Lake City Of is 1.49 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 1.49 ppb |
| 2021 | 1.15 ppb |
| 2018 | 0 (not detected) |
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. Rock Lake City Of's 1.49 ppb sits at the 62nd percentile in North Dakota and the 63rd nationally (higher means more lead).
Other water systems in Towner County
2 other systems share Towner County; 1 of them has a higher latest lead result than Rock Lake City Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Cando City Of | 1,115 | 15.2 ppb |
| Bisbee City Of | 126 | 0.89 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Rock Lake, 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 Rock Lake 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. Why sampled homes are the worst-case ones is in the guide to reading the number. Systems that went over once often dip back under; here is what that means.