Mexico Water Hardness & Quality Report (2026)
Water Hardness
13.6 grains per gallon
Source
river
pH Level
8.5
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
555.7 mg/L
Est. Daily Cost
$0.62
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 Mexico, your appliances are currently losing 31% efficiency due to mineral buildup.
| Appliance | In Mexico | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.9 yrs | 8.5 yrs | -78% |
| Washing Machine | 5 yrs | 12 yrs | -58% |
| Water Heater | 6.3 yrs | 15 yrs | -58% |
Regional Water Comparison
How Mexico compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Mexico, Missouri | 233.5 mg/L | 7.1 ppt | 🔴 Very Hard | river |
| Fulton, Missouri | 210.5 mg/L | 6.5 ppt | 🔴 Very Hard | river |
| Columbia, Missouri | 181.5 mg/L | 5.8 ppt | 🔴 Very Hard | river |
| Moberly, Missouri | 284.5 mg/L | 8.4 ppt | 🔴 Very Hard | river |
| Jefferson City, Missouri | 188.5 mg/L | 6 ppt | 🔴 Very Hard | river |
National Benchmark
How Mexico compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mexico | 233.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Mexico's Water Unique?
Local geology and source profile
Mexico, Missouri, in Audrain County — an Audrain County city adjacent to Moberly and Fulton on the Salt River in north-central Missouri — receives its water from the City of Mexico Water Department, drawing from the Salt River through the north-central Missouri distribution.
The very hard 233.5 mg/L hardness and high TDS of 555.7 mg/L reflect the Audrain County Salt River supply's very hard calcareous character — the Ordovician Gasconade Dolomite and Mississippian Burlington-Keokuk Limestone are both highly calcareous formations throughout the Ozark Plateau and north Missouri (compare Moberly MO: 229/546 in Randolph County comparable; Fulton MO: 237/565 in Callaway County comparable; Mexico consistent very hard from the same Audrain County Salt River Ordovician-Mississippian calcareous supply). The Salt River at Audrain County — Ordovician Gasconade Dolomite (dolomitic — primary hardness contributor), Mississippian Burlington-Keokuk Limestone (calcareous — secondary contributor), and Quaternary Salt River alluvium (calcareous — TDS contributor).
At 233.5 mg/L with TDS 556, Mexico's water is very hard — a water softener is strongly recommended to protect plumbing and appliances. Quarterly descaling is appropriate. The PFAS level of 7.1 ppt warrants a certified drinking water filter. Review the City of Mexico's annual water quality report for the latest monitoring data.
Geology & Source: Mexico in Audrain County draws from the Mexico Water on the Salt River (Audrain County, north-central Missouri) — the Salt River at Audrain County drains Ordovician Gasconade Dolomite (dolomitic) and Mississippian Burlington-Keokuk Limestone (calcareous) — Missouri Audrain County Salt River Ordovician-Mississippian calcareous supply produces very hard water at 233.5 mg/L with TDS 555.7 mg/L.