Mackenzie Ridge Llc, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 4.7 ppb (monitoring period 2022-2024). 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.
Who runs the water here
Mackenzie Ridge Llc serves about 180 people through 66 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Jefferson County, Missouri. EPA system ID: MO6048148; phone on file: 573-467-1722. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
That is down 8.1 ppb from 12.8 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Mackenzie Ridge Llc is 12.8 ppb across 7 monitoring periods, none of them over 15 ppb (4 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 4.7 ppb |
| 2021 | 12.8 ppb over 10 |
| 2021 | 12.8 ppb over 10 |
| 2018 | 12.1 ppb over 10 |
| 2017 | 12 ppb over 10 |
| 2016 | 7.3 ppb |
| 2016 | 7.81 ppb |
How Mackenzie Ridge Llc 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. Mackenzie Ridge Llc's 4.7 ppb sits at the 90th percentile in Missouri and the 90th nationally (higher means more lead).
Nearby utilities
65 other systems share Jefferson County; 9 of them have a higher latest lead result than Mackenzie Ridge Llc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Jefferson Co Cons Pwsd C 1 | 37,000 | 0 (not detected) |
| Jefferson County Pwsd 1 | 21,113 | 7.25 ppb |
| Jefferson County Pwsd 3 | 17,000 | 0 (not detected) |
| Jefferson County Pwsd 2 | 16,548 | 0 (not detected) |
| Festus Pws | 13,000 | 0 (not detected) |
| Jefferson County Pwsd 10 | 10,000 | 3.86 ppb |
| Jefferson County Pwsd 5 | 8,000 | 1.13 ppb |
| Jefferson County Pwsd 6 | 7,500 | 2.93 ppb |
| Desoto Pws | 6,400 | 1.46 ppb |
| Jefferson County Pwsd 7 | 6,100 | 1.7 ppb |
Next steps for Sullivan, MO
Test your own tap with a certified lab first-draw sample; Sullivan, 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 Mackenzie Ridge Llc 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. The action level is dropping - the 10 ppb rule from 2027.