Water Quality in Cranston, RI

Cranston's water quality is good overall. Hardness is low at 27 PPM, and no contaminants exceed health guidelines. Most homes here do not need a water softener.

Providence Water · Source: Scituate Reservoir · Serves 82,934 residents

27
Hardness (PPM)
82
TDS (PPM)
1
Chlorine (mg/L)
3
PFAS (ppt)
4
Lead (ppb)
27 PPM 0 400 Slightly Hard
CONTAMINANT LEVELS Hardness 27 PPM TDS 82 PPM PFAS 3 ppt Lead 4 ppb Chlorine 1 mg/L Nitrate 1 mg/L

Hardness Scale: Where Cranston Falls

Soft 060120180250400+
Generally good quality

Cranston shares Providence Water's Scituate Reservoir supply. Water is very soft.

What Cranston's Water Means for Your Home

Cranston's water is slightly hard at 27 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 Cranston, focus on contaminant filtration rather than softening.

Beyond hardness, Cranston's water quality is generally within EPA guidelines for regulated contaminants. Chlorine is present at 1 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)27 PPM< 60 PPMNo federal limit✓ OK
Total Dissolved Solids82 PPM< 300 PPM500 PPM✓ OK
PFAS (total)3 ppt4 ppt (EPA)4 ppt (2024)✓ OK
Lead4 ppb0 ppb (no safe level)15 ppb (action level)✓ Low
Chlorine / Chloramine1 mg/LTaste threshold ~1.04.0 mg/L✓ Normal
Nitrate1 mg/L5 mg/L10 mg/L✓ OK

Good news for ${esc(c.city)} residents. Your water quality is generally good. Most homes in this area do not need a water softener. If you have concerns about lead (especially in buildings constructed before 1986) or chlorine taste, a point-of-use filter is the most practical and cost-effective solution.

About Cranston's Water Supply

Water Utility: Providence Water

Water Source: Scituate Reservoir

Population Served: 82,934

Hardness: 27 PPM (1.6 grains per gallon)

Water quality can vary by neighborhood and season. The values above represent typical averages reported by Providence Water. 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 Cranston to Other Rhode Island Cities

Providence

33 PPM · Slightly Hard

Warwick

39 PPM · Slightly Hard

Frequently Asked Questions About Cranston Water

Is Cranston tap water safe to drink?
Cranston'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 Cranston?
No. At 27 PPM, Cranston's water is very soft. A water softener would provide no benefit here. Focus on filtration if you have specific contaminant concerns.
What water filter is best for Cranston?
The best filter depends on which contaminants you want to address. See our softener vs. filter guide to understand the difference between these categories.
Where does Cranston's water come from?
Cranston's drinking water is sourced from Scituate Reservoir and treated by Providence Water. Cranston shares Providence Water's Scituate Reservoir supply. Water is very soft.
What is the hardness of Cranston water in grains per gallon?
Cranston's water hardness is 1.6 grains per gallon (GPG), which equals 27 parts per million (PPM). This is classified as slightly hard. To convert: 1 GPG = 17.1 PPM.
Does Cranston water damage tankless water heaters?
At 1.6 GPG, Cranston'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 Cranston water safe for babies and infants?
Cranston'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 Providence Water Consumer Confidence Report. Hardness and contaminant levels represent typical average values and may vary by neighborhood and season. Last updated: 2026-02-12.