Marble Wc, CO
Lead detected, under the action levels
Latest 90th-percentile lead: 0.8 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.
Marble Wc at a glance
Marble Wc serves about 113 people through 48 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Gunnison County, Colorado. EPA system ID: CO0226500; phone on file: 970-963-8991. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
Against the period ending 2021 (0.3 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Marble Wc is 8.5 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0.8 ppb |
| 2021 | 0.3 ppb |
| 2020 | 1.4 ppb |
| 2019 | 1.1 ppb |
| 2018 | 2.5 ppb |
| 2017 | 8.5 ppb |
| 2016 | 2.7 ppb |
How Marble Wc compares
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. Marble Wc's 0.8 ppb sits at the 45th percentile in Colorado and the 47th nationally (higher means more lead).
Neighbouring systems
19 other systems share Gunnison County; 12 of them have a higher latest lead result than Marble Wc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Gunnison City Of | 9,610 | 3 ppb |
| Mount Crested Butte Wsd | 3,296 | 1 ppb |
| Crested Butte Town Of | 2,440 | 6 ppb |
| Crested Butte South | 2,000 | 0 (not detected) |
| Gunnison County Wsd | 800 | 1.6 ppb |
| Evergreen Lake Company | 431 | 2 ppb |
| Riverland Lot Owners Assoc | 368 | 0.5 ppb |
| Skyland Md | 335 | 2 ppb |
| Antelope Hills Assoc | 265 | 1 ppb |
| Meridian Lake Park | 250 | 3 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Carbondale, CO 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 Marble 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. Why sampled homes are the worst-case ones is in the guide to reading the number. The action level is dropping - the 10 ppb rule from 2027.