Water Quality in Mobile, AL

Mobile's water quality is good overall. Hardness is low at 69 PPM, and no contaminants exceed health guidelines. Most homes here do not need a water softener.

MAWSS · Source: Big Creek Lake · Serves 187,041 residents

69
Hardness (PPM)
127
TDS (PPM)
1.5
Chlorine (mg/L)
4
PFAS (ppt)
3
Lead (ppb)
69 PPM 0 400 Moderately Hard
CONTAMINANT LEVELS Hardness 69 PPM TDS 127 PPM PFAS 4 ppt Lead 3 ppb Chlorine 1.5 mg/L Nitrate 1 mg/L

Hardness Scale: Where Mobile Falls

Soft 060120180250400+
Moderately hard water

Mobile's water is moderately hard at 69 PPM. Gulf Coast cities often face infrastructure challenges, and the warm climate accelerates biological growth in distribution systems, requiring higher disinfectant residuals.

What Mobile's Water Means for Your Home

Mobile's water is moderately hard at 69 PPM. At this level, hard water is not a significant concern for most households. Scale buildup is minimal, and a water softener would provide little measurable benefit. If you are considering water treatment in Mobile, focus on contaminant filtration rather than softening.

Beyond hardness, Mobile's water quality is generally within EPA guidelines for regulated contaminants. Chlorine is present at 1.5 mg/L as a disinfectant residual, which is normal for municipal water systems. If you notice a pool-like taste or experience dry skin, a whole-house carbon filter is the most common and affordable solution. For homeowners who want to understand the full picture, requesting your utility's annual Consumer Confidence Report provides neighborhood-level data.

ContaminantDetectedHealth GuidelineLegal LimitStatus
Hardness (as CaCO₃)69 PPM< 60 PPMNo federal limit✓ OK
Total Dissolved Solids127 PPM< 300 PPM500 PPM✓ OK
PFAS (total)4 ppt4 ppt (EPA)4 ppt (2024)✓ OK
Lead3 ppb0 ppb (no safe level)15 ppb (action level)✓ Low
Chlorine / Chloramine1.5 mg/LTaste threshold ~1.04.0 mg/L✓ Normal
Nitrate1 mg/L5 mg/L10 mg/L✓ OK

Recommendations for Mobile Homes

🔄 Salt-Free Conditioner (Optional)
At 69 PPM, Mobile's water is moderately hard. Scale buildup is slow but noticeable over years, especially in tankless water heaters. A salt-free conditioner is a low-maintenance option if you want to extend appliance life.
Learn more about this solution →

About Mobile's Water Supply

Water Utility: MAWSS

Water Source: Big Creek Lake

Population Served: 187,041

Hardness: 69 PPM (4 grains per gallon)

Water quality can vary by neighborhood and season. The values above represent typical averages reported by MAWSS. To get exact numbers for your address, request a copy of the most recent Consumer Confidence Report (CCR) from your utility, or have your water independently tested.

Compare Mobile to Other Alabama Cities

Huntsville

130 PPM · Hard

Birmingham

50 PPM · Slightly Hard

Montgomery

41 PPM · Slightly Hard

Tuscaloosa

72 PPM · Moderately Hard

Hoover

93 PPM · Moderately Hard

Dothan

61 PPM · Moderately Hard

Frequently Asked Questions About Mobile Water

Is Mobile tap water safe to drink?
Mobile's water meets EPA legal standards for drinking water safety. However, legal limits and health-optimal levels are different things. Review the contaminant table above for specific numbers and how they compare to both legal limits and health guidelines.
Do I need a water softener in Mobile?
At 69 PPM, Mobile's water is moderately hard. Some homeowners at this level do not notice problems, while others see spotting on glassware, film on shower doors, or reduced soap lathering. Homes with tankless water heaters at this hardness level should strongly consider at least a salt-free conditioner, as scale buildup inside the heat exchanger can void the warranty. For other homes, it depends on your sensitivity and fixtures.
What water filter is best for Mobile?
The best filter depends on which contaminants you want to address. For chlorine taste and odor, an activated carbon filter is effective and affordable, available as under-sink, countertop, or whole-house systems. See our softener vs. filter guide to understand the difference between these categories.
Where does Mobile's water come from?
Mobile's drinking water is sourced from Big Creek Lake and treated by MAWSS. Mobile's water is moderately hard at 69 PPM. Gulf Coast cities often face infrastructure challenges, and the warm climate accelerates biological growth in distribution systems, requiring higher disinfectant residuals.
What is the hardness of Mobile water in grains per gallon?
Mobile's water hardness is 4 grains per gallon (GPG), which equals 69 parts per million (PPM). This is classified as moderately hard. To convert: 1 GPG = 17.1 PPM.
Does Mobile water damage tankless water heaters?
At 4 GPG, Mobile's water is unlikely to cause significant issues for tankless water heaters. However, if you notice reduced flow or efficiency over time, scale buildup could be a factor. Annual flushing with vinegar is good maintenance regardless of hardness.
Is Mobile water safe for babies and infants?
Mobile's water meets all EPA safety standards and is generally considered safe for preparing infant formula. The hardness minerals (calcium and magnesium) are not harmful. If your home has older plumbing, running cold water for 30 seconds before use is a good precaution to flush any lead from pipes.

Data sources. Water quality data compiled from EPA SDWIS, EWG Tap Water Database, USGS water hardness studies, and the MAWSS Consumer Confidence Report. Hardness and contaminant levels represent typical average values and may vary by neighborhood and season. Last updated: 2026-02-12.