Cathay City Of, ND
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 11.5 ppb (monitoring period 2025-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Under the current 15 ppb rule this is not an exceedance, but it is above the 10 ppb action level that takes over in Nov 2027. Test your own tap; filter if your result shows lead.
Who runs the water here
Cathay City Of serves about 43 people through 28 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 Wells County, North Dakota. EPA system ID: ND5200169; phone on file: 701-399-9527. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is down 2.39 ppb from 13.89 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Cathay City Of is 60 ppb across 14 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 11.5 ppb over 10 |
| 2025 | 13.89 ppb over 10 |
| 2024 | 60 ppb over 15 |
| 2024 | 6 ppb |
| 2023 | 5.05 ppb |
| 2023 | 15.6 ppb over 15 |
| 2022 | 2.84 ppb |
| 2022 | 7.1 ppb |
| 2021 | 3.53 ppb |
| 2021 | 4.39 ppb |
| 2020 | 2.7 ppb |
| 2020 | 4.18 ppb |
| 2019 | 4.65 ppb |
| 2016 | 10.2 ppb over 10 |
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. Cathay City Of's 11.5 ppb sits at the 98th percentile in North Dakota and the 98th nationally (higher means more lead).
Neighbouring systems
5 other systems share Wells County; 0 of them have a higher latest lead result than Cathay City Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Central Plains Water District | 3,504 | 1.02 ppb |
| Harvey City Of | 1,783 | 6.81 ppb |
| Fessenden City Of | 479 | 0 (not detected) |
| Bowdon City Of | 131 | 1.23 ppb |
| Sykeston City Of | 117 | 0.83 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Cathay, 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 Cathay City Of whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 2520 ppb (copper action level 1,300 ppb).
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. This system is in the band the 2027 10 ppb rule changes.