Ware Lake Subd, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 7.13 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 Ware Lake Subd
Ware Lake Subd serves about 100 people through 34 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: MO6036148. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
That is down 1.17 ppb from 8.3 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Ware Lake Subd is 8.3 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 7.13 ppb |
| 2022 | 8.3 ppb |
| 2019 | 3.26 ppb |
| 2018 | 3.26 ppb |
| 2016 | 4.8 ppb |
Against other Missouri systems
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. Ware Lake Subd's 7.13 ppb sits at the 96th percentile in Missouri and the 95th nationally (higher means more lead).
Other water systems in Jefferson County
65 other systems share Jefferson County; 6 of them have a higher latest lead result than Ware Lake Subd. 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 |
Your move
Test your own tap with a certified lab first-draw sample; Dittmer, 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 Ware Lake Subd 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. Why sampled homes are the worst-case ones is in the guide to reading the number. Size matters more than most people expect: small vs large water systems.