Sans Souci Cooperative, CO
Exceeded the action level in the past
Latest 90th-percentile lead: 2.5 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. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
Sans Souci Cooperative at a glance
Sans Souci Cooperative serves about 150 people through 63 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Boulder County, Colorado. EPA system ID: CO0107702; phone on file: 970-370-6955. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is up 1.5 ppb from 1 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Sans Souci Cooperative is 41 ppb across 14 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2.5 ppb |
| 2024 | 1 ppb |
| 2023 | 1 ppb |
| 2022 | 1 ppb |
| 2022 | 0 (not detected) |
| 2021 | 2 ppb |
| 2021 | 3 ppb |
| 2020 | 2 ppb |
| 2020 | 2 ppb |
| 2019 | 3 ppb |
| 2019 | 0 (not detected) |
| 2018 | 41 ppb over 15 |
| 2017 | 11 ppb over 10 |
| 2016 | 5.5 ppb |
How Sans Souci Cooperative 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. Sans Souci Cooperative's 2.5 ppb sits at the 79th percentile in Colorado and the 77th nationally (higher means more lead).
Other water systems in Boulder County
39 other systems share Boulder County; 4 of them have a higher latest lead result than Sans Souci Cooperative. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Boulder City Of | 166,080 | 2 ppb |
| Longmont City Of | 104,178 | 1.6 ppb |
| Erie Town Of | 47,444 | 2.6 ppb |
| Lafayette City Of | 28,700 | 2 ppb |
| Louisville City Of | 20,975 | 0 (not detected) |
| Left Hand Wd | 20,280 | 1 ppb |
| Superior Md No 1 | 17,900 | 0 (not detected) |
| Longs Peak Wd | 3,200 | 2 ppb |
| Lyons Town Of | 2,990 | 0 (not detected) |
| Nederland Town Of | 2,406 | 1 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Boulder, 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 Sans Souci Cooperative 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. More in what a past exceedance means today.