Spring Valley Mutual Wa, CO
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2026-2026). 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.
Spring Valley Mutual Wa at a glance
Spring Valley Mutual Wa serves about 100 people through 36 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Boulder County, Colorado. EPA system ID: CO0107719; phone on file: 303-938-1628. They can tell you what your service line is made of and whether they pay to replace it.
Spring Valley Mutual Wa's lead record
Against the period ending 2025 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Spring Valley Mutual Wa is 29 ppb across 17 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 1 ppb |
| 2024 | 1 ppb |
| 2023 | 2.5 ppb |
| 2022 | 1.5 ppb |
| 2022 | 1 ppb |
| 2021 | 0.5 ppb |
| 2021 | 0.5 ppb |
| 2020 | 1.5 ppb |
| 2020 | 0.5 ppb |
| 2019 | 2 ppb |
| 2019 | 2 ppb |
| 2018 | 0 (not detected) |
| 2018 | 29 ppb over 15 |
| 2017 | 8 ppb |
| 2017 | 0 (not detected) |
| 2016 | 1 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. Spring Valley Mutual Wa's reported as 0 (not detected) sits at the 6th percentile in Colorado and the 9th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
39 other systems share Boulder County; 17 of them have a higher latest lead result than Spring Valley Mutual Wa. 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 Spring Valley Mutual Wa whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 2260 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. The lead result guide covers how utilities pick the homes they sample. More in what a past exceedance means today.