Hopkinsville Water Hardness & Quality Report (2026)
Water Hardness
13.6 grains per gallon
Source
river
pH Level
8.5
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
594.7 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 Hopkinsville, your appliances are currently losing 31% efficiency due to mineral buildup.
| Appliance | In Hopkinsville | 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 Hopkinsville compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Hopkinsville, Kentucky | 233.5 mg/L | 7 ppt | 🔴 Very Hard | river |
| Fort Campbell North, Kentucky | 214.5 mg/L | 6.5 ppt | 🔴 Very Hard | river |
| Clarksville, Tennessee | 139.5 mg/L | 4.7 ppt | 🟠 Hard | reservoir |
| Madisonville, Kentucky | 174.5 mg/L | 5.6 ppt | 🟠 Hard | river |
| Springfield, Tennessee | 96 mg/L | 3.2 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Hopkinsville compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Hopkinsville | 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 Hopkinsville's Water Unique?
Local geology and source profile
Hopkinsville, Kentucky, the Christian County seat — a major west Kentucky military and agricultural city (Hopkinsville is the Christian County seat and the commercial hub of west Kentucky — the largest city between Bowling Green and Paducah in western Kentucky; Hopkinsville is closely tied to Fort Campbell (the major US Army installation straddling the Kentucky–Tennessee border — one of the largest military installations in the US, home of the 101st Airborne Division Air Assault, the famous 'Screaming Eagles'), home of the Pennyrile/Pennyroyal region (the distinctive Kentucky landscape region named for the pennyroyal herb plant that grows abundantly on the region's karst limestone plains), famous as the 'Eclipse Crossroads of America' (Hopkinsville was the point of greatest totality for both the 2017 and 2024 total solar eclipses — the only US city to hold this distinction twice), and a diverse Christian County community — draws its municipal water supply from the Little River via the Hopkinsville Water Environment Authority. Water hardness in Hopkinsville measures 233.5 mg/L — classified as very hard.
Hopkinsville's very hard supply reflects the west Kentucky Pennyroyal Plain's highly calcareous Mississippian limestone karst geology. The Little River watershed at Hopkinsville–Christian County drains the Mississippian St. Louis and Ste. Genevieve Limestone (highly calcareous carbonate of the Kentucky karst plain). Limited treatment produces the very hard 233.5 mg/L.
At 233.5 mg/L, Hopkinsville residents face significant hard water challenges. Regular water softeners and descaling are strongly recommended. Hopkinsville Water Environment Authority consistently delivers water meeting all Kentucky DEP and EPA Safe Drinking Water Act requirements.
Geology & Source: River supply from the Little River (Lake Barkley watershed) via the Hopkinsville Water Environment Authority — the Christian County west Kentucky Pennyroyal Plain (Mississippian calcareous St. Louis and Ste. Genevieve Limestone — the highly calcareous west Kentucky Pennyroyal carbonate karst plain; Christian County Little River supply with limited softening); very hard supply at 233.5 mg/L in Christian County.