ZIP Code 37691
Johnson County, Tennessee — Trade
What This Means
Johnson County, Tennessee has naturally soft water, estimated at 46 mg/L (PPM). Soft water is generally good for appliances and plumbing — it produces less scale buildup. You likely don't need a water softener. Soft water may feel slightly "slippery" and lathers soap easily.
What You Should Do
Hardness Details
| ZIP Code | 37691 |
| County | Johnson |
| City | Trade |
| State | Tennessee (TN) |
| Hardness (PPM) | 46 mg/L — Soft |
| Hardness (GPG) | 2.7 grains/gallon |
| Classification | 0 - 60 mg/L |
Source: USGS Water Quality Portal, county-level median
USGS Monitoring Data
| Monitoring Stations | 77 |
| Range | 1 – 170 mg/L |
| Most Recent Data | 2018 |
| Data Quality | Measured |
Source: USGS Water Quality Portal
Effects at 46 PPM Hardness
At 46 ppm, your water is soft. You are unlikely to notice mineral effects on skin, hair, or appliances. Soap lathers easily, dishes come out spot-free, and your water heater and plumbing will not accumulate scale buildup.
Is Trade Water Safe to Drink?
Yes. Hard water at 46 ppm in Trade is safe to drink. The calcium and magnesium that make water hard are actually essential minerals your body needs daily. The World Health Organization confirms there are no health-based guidelines for water hardness.
At this level, taste is generally good. Most people will not notice a mineral flavor, and the water is perfectly suitable for drinking, cooking, and making coffee or tea.
Your Water vs National Average
Trade water at 46 ppm is 54% softer than the US average of approximately 100 ppm. Your area benefits from naturally soft water, which is gentler on plumbing, appliances, skin, and hair than what most Americans experience.
Best Solution for 46 PPM Water
No softener needed. Your soft water at 46 ppm is ideal for skin, hair, and appliances. You are in the fortunate minority of US homes that do not need water treatment for hardness. Enjoy the benefits of naturally soft water: easy soap lathering, spot-free dishes, and long-lasting appliances.
Johnson County Water Hardness Map
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Frequently Asked Questions
What is the water hardness for ZIP code 37691?
ZIP code 37691 is in Johnson County, Tennessee, with estimated water hardness of 46 mg/L (2.7 GPG), classified as soft.
Do I need a water softener in 37691?
With soft water at 46 PPM, a water softener is generally not needed.
What county is ZIP code 37691 in?
ZIP code 37691 is in Johnson County, Tennessee (TN).
Is Trade water hard or soft?
Trade water is classified as soft with an estimated hardness of 46 ppm (2.7 GPG). This is soft water — no treatment is needed.
Is hard water in 37691 safe to drink?
Yes, hard water in ZIP code 37691 at 46 ppm is safe to drink. The calcium and magnesium minerals are actually beneficial for your health. At this level, the water tastes normal and requires no filtration for drinking purposes.
Will 46 PPM water damage my appliances?
At 46 ppm (soft), your water will not cause mineral damage to appliances. You can expect full lifespan from your water heater, dishwasher, and plumbing.
Do I need a water softener in Johnson County?
No — Johnson County has soft water at 46 ppm. A water softener is not necessary.
Is Trade water OK for aquariums and plants?
Yes — soft water at 46 ppm is ideal for most tropical fish (bettas, tetras, discus) and acid-loving plants. African cichlids may need mineral supplements.