Cookeville Water Hardness & Quality Report (2026)
Water Hardness
12.6 grains per gallon
Source
reservoir
pH Level
8.4
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
543.9 mg/L
Est. Daily Cost
$0.58
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 Cookeville, your appliances are currently losing 29% efficiency due to mineral buildup.
| Appliance | In Cookeville | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 2.5 yrs | 8.5 yrs | -71% |
| Washing Machine | 5.6 yrs | 12 yrs | -53% |
| Water Heater | 7 yrs | 15 yrs | -53% |
Regional Water Comparison
How Cookeville compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Cookeville, Tennessee | 216 mg/L | 7.2 ppt | 🔴 Very Hard | reservoir |
| McMinnville, Tennessee | 212 mg/L | 7.1 ppt | 🔴 Very Hard | reservoir |
| Lebanon, Tennessee | 230 mg/L | 7.7 ppt | 🔴 Very Hard | reservoir |
| Glasgow, Kentucky | 246 mg/L | 7.3 ppt | 🔴 Very Hard | river |
| Murfreesboro, Tennessee | 110.5 mg/L | 3.7 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Cookeville compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Cookeville | 216 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Cookeville's Water Unique?
Local geology and source profile
Cookeville, Tennessee, the Putnam County seat — a major north Tennessee Cumberland Plateau university city (Cookeville is the Putnam County seat and the largest city on Tennessee's Cumberland Plateau — the commercial, medical, and educational hub of the Upper Cumberland region; Tennessee Tech University is in Cookeville — a significant STEM-focused university with strong engineering and education programs), home of the Upper Cumberland region (one of Tennessee's most distinctive geographic regions — a complex of valleys, plateaus, and river gorges on the western escarpment of the Cumberland Plateau; the Upper Cumberland is known for its outdoor recreation, river gorges, and the Cookeville Depot Museum), a diverse Putnam County community with a significant working-class, manufacturing, and Tennessee Tech student population, and the commercial hub for many surrounding rural Upper Cumberland communities — draws its municipal water supply from the Calfkiller River via the City of Cookeville Water Division. Water hardness in Cookeville measures 216 mg/L — classified as very hard.
Cookeville's very hard supply reflects the north Tennessee Cumberland Plateau Mississippian limestone geology. The Calfkiller River watershed at Cookeville–Putnam County drains the Mississippian Warsaw and Fort Payne Limestone (highly calcareous carbonate of the Tennessee Highland Rim and Plateau). City of Cookeville applies limited treatment, producing the very hard 216 mg/L.
At 216 mg/L, Cookeville residents face significant hard water challenges. Regular water softeners and descaling are strongly recommended. City of Cookeville Water Division consistently delivers water meeting all Tennessee DEC and EPA Safe Drinking Water Act requirements.
Geology & Source: Reservoir supply from the Calfkiller River (Burgess Falls area) via the City of Cookeville Water Division — the Putnam County north Tennessee Highland Rim Cumberland Plateau (Mississippian calcareous Warsaw and Fort Payne Limestone — the highly calcareous north Tennessee Highland Rim carbonate plateau; Putnam County Cumberland Plateau supply with limited softening); very hard supply at 216 mg/L in Putnam County.