Cs Mormon Lake Water Company, MO
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 13 ppb (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. 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
Cs Mormon Lake Water Company serves about 353 people through 138 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Coconino County, Missouri. EPA system ID: AZ0403014; phone on file: 602-698-9786. They can tell you what your service line is made of and whether they pay to replace it.
Cs Mormon Lake Water Company's lead record
The highest 90th-percentile result EPA holds for Cs Mormon Lake Water Company is 13 ppb across 1 monitoring period, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 13 ppb over 10 |
How Cs Mormon Lake Water Company compares
Of the 1,674 Missouri systems with a lead result, the median latest reading is 1.04 ppb; 2 are over 15 ppb right now and 74 have gone over at some point. Cs Mormon Lake Water Company's 13 ppb sits at the 99th percentile in Missouri and the 98th nationally (higher means more lead).
Neighbouring systems
3 other systems share Coconino County; 0 of them have a higher latest lead result than Cs Mormon Lake Water Company. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Cs Hydro Resources-Tusayan | 1,710 | 0 (not detected) |
| Cs Flagstaff Ranch Water Company | 350 | 0 (not detected) |
| Cs West Village Water Company | 210 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; St. Louis, MO 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 Cs Mormon Lake Water Company 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. See what changes at 10 ppb in 2027.