Coalby Domestic Wc, CO
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.
About Coalby Domestic Wc
Coalby Domestic Wc serves about 239 people through 128 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Delta County, Colorado. EPA system ID: CO0115185; phone on file: 970-856-6690. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is down 1.6 ppb from 1.6 ppb in the period ending 2023. The highest 90th-percentile result EPA holds for Coalby Domestic Wc is 2.5 ppb across 6 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2023 | 1.6 ppb |
| 2022 | 0.8 ppb |
| 2022 | 2.5 ppb |
| 2017 | 0.4 ppb |
| 2016 | 0.9 ppb |
Against other Colorado systems
Of the 1,025 Colorado systems with a lead result, the median latest reading is 1 ppb; 2 are over 15 ppb right now and 71 have gone over at some point. Coalby Domestic Wc's reported as 0 (not detected) sits at the 14th percentile in Colorado and the 17th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
29 other systems share Delta County; 20 of them have a higher latest lead result than Coalby Domestic Wc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Delta City Of | 8,700 | - |
| Orchard City Town Of | 3,100 | 7 ppb |
| Upper Surface Creek Domestic Wua | 2,800 | 3 ppb |
| Paonia Town Of | 2,499 | 1.2 ppb |
| Cedaredge Town Of | 2,400 | 2 ppb |
| Hotchkiss Town Of | 2,050 | 0.8 ppb |
| Rogers Mesa Wc | 840 | 0 (not detected) |
| Crawford Mesa Wa | 486 | 8.4 ppb |
| Crawford Town Of | 477 | 1 ppb |
| Bone Mesa Domestic Wd | 400 | 0 (not detected) |
Your move
Look up your address in Coalby Domestic Wc'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 Coalby Domestic Wc 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. What a 90th-percentile result does and does not tell you: how to read a lead result. A zero today does not rule out a jump later - the rules are tightening in 2027.