Mason City Water Hardness & Quality Report (2026)
Water Hardness
11 grains per gallon
Source
river
pH Level
8.1
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
335.3 mg/L
Est. Daily Cost
$0.50
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Mason City, your appliances are currently losing 25% efficiency due to mineral buildup.
| Appliance | In Mason City | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.4 yrs | 8.5 yrs | -60% |
| Washing Machine | 6.7 yrs | 12 yrs | -44% |
| Water Heater | 8.1 yrs | 15 yrs | -46% |
Regional Water Comparison
How Mason City compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Mason City, Iowa | 187.5 mg/L | 4 ppt | 🔴 Very Hard | river |
| Albert Lea, Minnesota | 120 mg/L | 3.9 ppt | 🟠 Hard | river |
| Austin, Minnesota | 191.5 mg/L | 5.5 ppt | 🔴 Very Hard | river |
| Owatonna, Minnesota | 236.5 mg/L | 6.6 ppt | 🔴 Very Hard | river |
| Cedar Falls, Iowa | 163 mg/L | 3.5 ppt | 🟠 Hard | river |
National Benchmark
How Mason City compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mason City | 187.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Mason City's Water Unique?
Local geology and source profile
Mason City, Iowa, the Cerro Gordo County seat — a major north Iowa regional hub (Mason City is the Cerro Gordo County seat — the most important commercial and medical city in north Iowa; Mason City is famous as the hometown of Meredith Willson (Meredith Willson wrote 'The Music Man' (1957 — one of the most beloved American musical comedies; 'The Music Man' is set in the fictional 'River City, Iowa' which is widely understood to be based on Mason City; the opening number '76 Trombones' is one of the most celebrated songs in Broadway history; the show has been performed continuously by community and professional theaters since its premiere)); Mason City is known for its remarkable collection of Prairie Style architecture by Frank Lloyd Wright and Walter Burley Griffin (the Rock Crest–Rock Glen historic district is one of the finest collections of Prairie Style residential architecture in the world, with six Walter Burley Griffin–designed homes along Willow Creek; the Frank Lloyd Wright–designed Stockman House is also preserved in Mason City), a diverse Cerro Gordo County community with a primarily working-class, Scandinavian-heritage, and agricultural population — draws its municipal water supply via the City of Mason City Water Division. Water hardness in Mason City measures 187.5 mg/L — classified as hard.
Mason City's hard supply reflects the north Iowa Cerro Gordo County Paleozoic Platform dolomite aquifer's calcareous character. The Prairie du Chien Dolomite aquifer at Mason City draws from the Ordovician Prairie du Chien Dolomite (calcareous). City of Mason City applies limited softening, producing the hard 187.5 mg/L.
At 187.5 mg/L, Mason City residents face regular hard water challenges. Monthly descaling and water softeners are recommended. City of Mason City Water Division consistently delivers water meeting all Iowa DNR and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Jordan Aquifer and Shell Rock River via the City of Mason City Water Division — the Cerro Gordo County north Iowa Mason City corridor (Ordovician calcareous Prairie du Chien Dolomite — the calcareous north Iowa Cerro Gordo County Paleozoic Platform dolomite; limited softening); hard supply at 187.5 mg/L in Cerro Gordo County.