Monmouth Water Supply, IA
Lead detected, under the action levels
Latest 90th-percentile lead: 3 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.
About Monmouth Water Supply
Monmouth Water Supply serves about 129 people through 80 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Jackson County, Iowa. EPA system ID: IA4955001; phone on file: 563-212-0543. 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 2.8 ppb from 5.8 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Monmouth Water Supply is 6.6 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 3 ppb |
| 2021 | 5.8 ppb |
| 2018 | 6.6 ppb |
Where this result ranks
Of the 1,066 Iowa systems with a lead result, the median latest reading is 1.4 ppb; 4 are over 15 ppb right now and 36 have gone over at some point. Monmouth Water Supply's 3 ppb sits at the 74th percentile in Iowa and the 81st nationally (higher means more lead).
Neighbouring systems
9 other systems share Jackson County; 2 of them have a higher latest lead result than Monmouth Water Supply. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Maquoketa Municipal Water | 6,128 | 7.1 ppb |
| Bellevue Municipal Utilities | 2,363 | 0.5 ppb |
| Preston Muni Water Supply | 949 | 1.5 ppb |
| Sabula Water Supply | 506 | 1.6 ppb |
| Miles Water Department | 408 | 1.4 ppb |
| Andrew Water Supply | 380 | 0.8 ppb |
| La Motte Water Supply | 237 | 9.6 ppb |
| Springbrook Water Dept | 144 | 2.3 ppb |
| Baldwin Water Supply | 99 | 0.6 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Monmouth, IA 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 Monmouth Water Supply 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.