Quick Answer: Memphis water is very soft, averaging 1 to 3 grains per gallon (gpg), sourced entirely from the Memphis Sand Aquifer — one of the purest natural aquifers in the world. However, PFAS contamination discovered in recent years from industrial sources is now a significant concern. A water softener is not needed. A reverse osmosis system is strongly recommended for drinking water to address PFAS.
Is Memphis Water Hard or Soft?
Memphis Water Hardness Data
According to Memphis Light, Gas and Water (MLGW) annual water quality reports, Memphis water hardness ranges from 1 to 3 grains per gallon (gpg) — classified as very soft. The city uses chlorine as its primary disinfectant, which is easily removed by standard activated carbon filters. See the home water hardness test guide to verify your specific tap's hardness level.
Where Does Memphis Get Its Water?
Memphis draws its drinking water from Memphis Sand Aquifer (a.k.a. Memphis aquifer), managed by Memphis Light, Gas and Water (MLGW).
Memphis Light, Gas and Water (MLGW) draws water exclusively from the Memphis Sand Aquifer (officially the Memphis aquifer), a massive natural underground reservoir extending beneath Memphis and much of Shelby County. The aquifer consists of fine sand layers from ancient river deposits, naturally filtering water to exceptional clarity and purity over centuries-long underground travel. The aquifer's geology — primarily quartz sand, not calcium limestone — produces naturally very soft water. MLGW operates approximately 150 wells and 10 pumping stations to access this resource.
What Contaminants Are in Memphis Water?
According to Memphis Light, Gas and Water (MLGW) annual water quality reports and independent EWG Tap Water Database analysis, the primary concerns in Memphis drinking water include:
- Disinfection Byproducts: Memphis uses chlorine to disinfect water. When chlorine reacts with natural organic matter, it forms trihalomethanes (TTHMs) and haloacetic acids (HAA5) — compounds linked to increased cancer risk with long-term exposure.
- Key Concerns: PFAS contamination discovered in Memphis aquifer (from industrial sources including 3M/military facilities), legacy groundwater contamination from chemical spills, and low pH water (slightly corrosive due to natural softness).
- Agricultural and Urban Runoff: Depending on watershed proximity to farmland or industry, nitrates, pesticides, and industrial chemicals may be present at low levels.
Hard Water Effects in Memphis
At 1–3 gpg, Memphis water is very soft, meaning scale buildup is minimal and appliances are unlikely to be significantly affected by hardness.
While Memphis's water is very soft and does not cause severe scale problems, a home hardness test can confirm your specific levels and help you decide if any treatment is worthwhile.
Best Water Treatment Solutions for Memphis Homes
1. Water Softener — No
No — Memphis has some of the softest tap water in the US; a water softener is not needed and could increase water's corrosiveness. For Memphis's very soft water, a full water softener is generally unnecessary. However, a salt-free water conditioner (template-assisted crystallization) can help reduce any minor scale on fixtures without adding sodium to water.
2. Whole-Home Carbon Filtration
A whole-home carbon filter removes chlorine, disinfection byproducts (TTHMs, HAA5), chlorine taste and odor, and many industrial chemicals before water enters your home's plumbing. A standard activated carbon block filter works well for chlorine removal in Memphis.
3. Reverse Osmosis System (Drinking Water)
For drinking and cooking water, a reverse osmosis (RO) system under the kitchen sink is the most comprehensive solution. RO removes dissolved minerals to near-zero levels, plus filters out PFAS, nitrates, heavy metals, radium, disinfection byproducts, and most other contaminants of concern in Memphis water. Look for NSF/ANSI 58-certified systems. See our guide on water treatment options for 2026.
Memphis Water Hardness vs. Other Major Cities
| City | Hardness (gpg) | Classification |
|---|---|---|
| Las Vegas, NV | 16–18 | Extremely Hard |
| Phoenix, AZ | ~16 | Extremely Hard |
| Dallas, TX | ~14 | Very Hard |
| Memphis, TN | 1–3 | Very Soft |
| Chicago, IL | ~8.2 | Hard |
| Ottawa, ON | 2.5–5 | Soft to Moderately Soft |
| Seattle, WA | ~1.2 | Soft |
How to Test Your Water Hardness at Home
You can verify Memphis's water hardness at your specific tap using these simple methods:
- Test strips: Dip a water hardness test strip in a glass of cold tap water. Results appear in seconds. Accuracy: ±1–2 gpg. Inexpensive and widely available.
- The soap test: Fill a clear bottle halfway with tap water, add 10 drops of pure liquid castile soap, and shake vigorously. Abundant, persistent suds = soft water. Milky, soapy film with few suds = hard water.
- Visual check: White crusty deposits inside your toilet tank, on showerheads, or around faucet bases are limescale — a reliable sign of hard water above ~7 gpg.
- Lab test: For precise results, send a water sample to a certified lab. This also tests for contaminants beyond hardness. See our full home water testing guide.