Marshalltown Water Works, IA
Lead detected, under the action levels
Latest 90th-percentile lead: 2 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.
Marshalltown Water Works at a glance
Marshalltown Water Works serves about 27,680 people through 9,812 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Marshall County, Iowa. EPA system ID: IA6469042; phone on file: 641-753-7913. They can tell you what your service line is made of and whether they pay to replace it.
Marshalltown Water Works's lead record
Against the period ending 2022 (2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Marshalltown Water Works is 3 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2 ppb |
| 2022 | 2 ppb |
| 2019 | 2 ppb |
| 2016 | 3 ppb |
How Marshalltown Water Works compares
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. Marshalltown Water Works's 2 ppb sits at the 67th percentile in Iowa and the 73rd nationally (higher means more lead).
Other water systems in Marshall County
12 other systems share Marshall County; 4 of them have a higher latest lead result than Marshalltown Water Works. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| State Center Muni Water Dept | 1,411 | 0.5 ppb |
| Le Grand Water Works | 910 | 1.1 ppb |
| Melbourne Water Supply | 765 | 5.7 ppb |
| Gilman Water Supply | 582 | 0 (not detected) |
| Sunset Village | 528 | 0 (not detected) |
| Albion Water Department | 448 | 1.4 ppb |
| Marshalltown Estates | 382 | 3 ppb |
| Liscomb Water Supply | 291 | 0 (not detected) |
| Rhodes Water Supply | 271 | 0 (not detected) |
| Laurel Municipal Water Works | 220 | 3.2 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Marshalltown, 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 Marshalltown Water Works 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. The action level is dropping - the 10 ppb rule from 2027.