Biloxi Water Hardness & Quality Report (2026)
Water Hardness
7 grains per gallon
Source
groundwater
pH Level
7.8
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
354.6 mg/L
Est. Daily Cost
$0.32
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 Biloxi, your appliances are currently losing 16% efficiency due to mineral buildup.
| Appliance | In Biloxi | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.6 yrs | 8.5 yrs | -34% |
| Washing Machine | 9.2 yrs | 12 yrs | -23% |
| Water Heater | 10.8 yrs | 15 yrs | -28% |
Regional Water Comparison
How Biloxi compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Biloxi, Mississippi | 120 mg/L | 6.1 ppt | 🟠 Hard | groundwater |
| Ocean Springs, Mississippi | 140 mg/L | 6.9 ppt | 🟠 Hard | groundwater |
| West Gulfport, Mississippi | 50 mg/L | 3.5 ppt | 🟢 Soft | groundwater |
| Gulfport, Mississippi | 113 mg/L | 5.9 ppt | 🟡 Moderately Hard | groundwater |
| Long Beach, Mississippi | 125.5 mg/L | 6.3 ppt | 🟠 Hard | groundwater |
National Benchmark
How Biloxi compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Biloxi | 120 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Biloxi's Water Unique?
Local geology and source profile
Biloxi, Mississippi, in Harrison County on the Gulf of Mexico — a major Gulf Coast resort and casino city, home of Keesler Air Force Base (the Air Force's primary electronics training school), a historic French colonial settlement (one of the oldest continuously occupied French settlements in the Gulf Coast), and a gaming, seafood, and tourism hub known for the Biloxi shrimping industry and the iconic Beauvoir (Jefferson Davis's postwar home) — draws its municipal water supply from local groundwater aquifers via the City of Biloxi Public Works Water Division. Water hardness in Biloxi measures 120 mg/L — classified as moderately hard.
Biloxi's moderate hardness reflects the Harrison County Mississippi Gulf Coast aquifer system. The Biloxi area draws from the Miocene–Pliocene calcareous–siliciclastic coastal formations (Pascagoula Formation — calcareous-moderate clay and sand; Hattiesburg Formation — calcareous sand with shell beds; Citronelle Formation — calcareous-moderate gravelly sand). The Mississippi Gulf Coast calcareous marine terrace (Pleistocene coastal terrace with shell hash and calcareous oolitic deposits) also contributes dissolved calcium to local shallow aquifers. The combined Mississippi Gulf Coast calcareous Miocene–Pliocene–Pleistocene formations produce the moderate 120 mg/L at Biloxi.
At 120 mg/L, Biloxi residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. City of Biloxi Public Works Water Division consistently delivers water meeting all Mississippi MDEQ and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Biloxi–D'Iberville aquifer (Mississippi Sound Coastal Plain) and Pascagoula River watershed supply via the City of Biloxi Public Works Water Division — the Harrison County Mississippi Gulf Coast (Miocene–Pliocene Pascagoula and Hattiesburg Formation calcareous sand and clay); moderately hard supply at 120 mg/L in Harrison County.