Ridgetop Waterworks Corp Subdivision, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 1.77 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.
About Ridgetop Waterworks Corp Subdivision
Ridgetop Waterworks Corp Subdivision serves about 227 people through 51 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Wayne County, Missouri. EPA system ID: MO4036224; phone on file: 573-282-9675. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
Against the period ending 2022 (1.84 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Ridgetop Waterworks Corp Subdivision is 1.84 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.77 ppb |
| 2022 | 1.84 ppb |
| 2022 | 1.84 ppb |
| 2019 | 0.93 ppb |
| 2019 | 0.93 ppb |
| 2016 | 0.99 ppb |
| 2016 | 0.99 ppb |
Where this result ranks
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. Ridgetop Waterworks Corp Subdivision's 1.77 ppb sits at the 66th percentile in Missouri and the 67th nationally (higher means more lead).
Other water systems in Wayne County
14 other systems share Wayne County; 3 of them have a higher latest lead result than Ridgetop Waterworks Corp Subdivision. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Piedmont Pws | 1,987 | 0 (not detected) |
| Wayne & Butler County Pwsd 4 | 1,400 | 0 (not detected) |
| Wayne County Pwsd 2 | 950 | 0 (not detected) |
| Greenville Pws | 497 | 0 (not detected) |
| Community Water System | 378 | 6.15 ppb |
| Williamsville Pws | 342 | 0 (not detected) |
| Wayne County Pwsd 3 | 300 | 7.1 ppb |
| Liberty Utilities Whispering Hills Subd | 150 | 0 (not detected) |
| Lost Creek Water Company | 133 | 0.63 ppb |
| Mill Spring Pws | 112 | 1.1 ppb |
Next steps for Wappapello, MO
Test your own tap with a certified lab first-draw sample; Wappapello, 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 Ridgetop Waterworks Corp Subdivision 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. The lead result guide covers how utilities pick the homes they sample. Size matters more than most people expect: small vs large water systems.