Twmp Llc, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 1.9 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.
Who runs the water here
Twmp Llc serves about 100 people through 33 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Phelps County, Missouri. EPA system ID: MO3048124; phone on file: 314-808-1124. They can tell you what your service line is made of and whether they pay to replace it.
Twmp Llc's lead record
That is up 1.9 ppb from 0 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Twmp Llc is 1.9 ppb across 6 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.9 ppb |
| 2022 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2019 | 0 (not detected) |
How Twmp 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. Twmp Llc's 1.9 ppb sits at the 69th percentile in Missouri and the 68th nationally (higher means more lead).
Other water systems in Phelps County
14 other systems share Phelps County; 3 of them have a higher latest lead result than Twmp Llc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Rolla Pws | 20,800 | 3.91 ppb |
| St James Pws | 3,935 | 0 (not detected) |
| Phelps County Pwsd 2 South | 1,763 | 2.23 ppb |
| Phelps County Pwsd 1 | 800 | 0 (not detected) |
| Phelps County Pwsd 2 North | 523 | 0 (not detected) |
| Newburg Pws | 324 | 0.59 ppb |
| Kvc | 200 | 0 (not detected) |
| Gladlo Water & Sewer Inc | 182 | 0.51 ppb |
| Lakeside Community Inc | 160 | 0 (not detected) |
| Stately Mansion Mobile Villa | 100 | 0 (not detected) |
Next steps for Union, MO
Test your own tap with a certified lab first-draw sample; Union, 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 Twmp 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. Systems that went over once often dip back under; here is what that means.