Calvey Brook Estates, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 5.79 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. 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
Calvey Brook Estates serves about 40 people through 16 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Franklin County, Missouri. EPA system ID: MO6031385; phone on file: 314-464-3964. They can tell you what your service line is made of and whether they pay to replace it.
Calvey Brook Estates's lead record
That is down 1.48 ppb from 7.27 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Calvey Brook Estates is 7.27 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 5.79 ppb |
| 2025 | 7.27 ppb |
| 2024 | 5.54 ppb |
| 2024 | 4.4 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. Calvey Brook Estates's 5.79 ppb sits at the 94th percentile in Missouri and the 92nd nationally (higher means more lead).
Neighbouring systems
39 other systems share Franklin County; 3 of them have a higher latest lead result than Calvey Brook Estates. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Washington Pws | 14,068 | 2.62 ppb |
| Union Pws | 12,348 | 2.48 ppb |
| Franklin County Pwsd 3 | 8,250 | 1.9 ppb |
| Lake Royale S/D | 5,890 | 0.9 ppb |
| St Clair Pws | 4,700 | 2.23 ppb |
| Franklin County Pwsd 1 | 3,500 | 4.13 ppb |
| New Haven Pws | 2,000 | 0 (not detected) |
| Gerald Pws | 1,383 | 2.9 ppb |
| Franklin County Pwsd 3 St Albans | 1,300 | 1.88 ppb |
| Franklin County Pwsd 4 | 760 | 2.89 ppb |
Your move
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 Calvey Brook Estates 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. Size matters more than most people expect: small vs large water systems.