Is Roswell, NM Tap Water Safe to Drink?
Yes, Roswell tap water is safe to drink. No contaminants exceed health guidelines. However, Roswell has very hard water at 310 PPM, which will cause scale buildup in plumbing and appliances over time. A water softener is worth considering.
Hardness Scale: Where Roswell Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Roswell Compares
Roswell's water is 125% harder than the national average of 138 PPM. It ranks #18 out of 1000 cities in our database (harder than 98% of US cities we track). Within New Mexico, Roswell has the 2nd hardest water out of 9 cities - 49% above the state average of 208 PPM. Among cities (50k-100k), Roswell ranks #4 of 258 for hardness. At this hardness level, water heaters run an estimated 57% less efficiently due to scale insulation, and major water-using appliances typically last 4 years less than the national average lifespan.
What Roswell's Water Means for Your Home
Hardness: 310 PPM - Treatment Recommended
Roswell has some exceptionally hard water. At 310 PPM (18.1 grains per gallon), your tap is loaded with dissolved calcium and magnesium picked up from underground limestone and dolomite formations. Here's the thing: it's perfectly safe to drink. The minerals won't hurt you. But they will hurt your wallet. That adds up. Hard water at 310 PPM increases household costs through scale-coated water heaters that use more energy, extra soap and detergent, and appliances that wear out faster. Most Roswell homeowners don't realize it until the plumber shows up. That's 49% harder than the New Mexico average.
Contaminants & Safety
Beyond hardness, Roswell's water is within EPA guidelines for regulated contaminants. Chlorine sits at 1.1 mg/L — normal for municipal systems, but enough to notice. That said, 11 contaminants exceed EWG's stricter health guidelines — these are legal but worth understanding. If your water tastes like a pool or your skin feels dry after showers, a whole-house carbon filter is the simplest fix. A shower filter is a quick, affordable starting point that most people notice immediately. Want the full picture? Request your utility's annual Consumer Confidence Report for neighborhood-level data.
What's in the Treatment Process
Chromium-6 is naturally present in Roswell's aquifer geology at 0.288 ppb — 14x the EWG health guideline. There's no federal legal limit for chromium-6 specifically (only total chromium), which is why EWG tracks it separately. All measurements are within federal legal limits. The EWG guidelines represent a more conservative, health-based standard.
How Hard Water Affects Your Home
At 310 PPM, untreated hard water has measurable effects on household costs and appliance life:
- Water heater inefficiency: Scale insulation forces the heater to work harder (DOE estimates up to 22% more energy for heavily scaled units)
- Soap and detergent: Hard water reduces lathering, requiring significantly more product
- Appliance replacement: Water heaters, dishwashers, and washing machines fail 2-4 years earlier due to scale buildup
- Plumbing maintenance: Scale buildup in pipes reduces flow and requires more frequent service
Note: Impact varies by household size, water usage, and local energy costs. A home water test provides the most accurate assessment for your specific situation.
| Contaminant | Detected | Health Guideline | Legal Limit | Status |
|---|---|---|---|---|
| Hardness (as CaCO₃) | 310 PPM | < 60 PPM | No federal limit | ⚠ Very Hard |
| Total Dissolved Solids | 403 PPM | < 300 PPM | 500 PPM | ⚠ Elevated |
| PFAS (total) | 0 ppt | — | No total limit | ✓ ND |
| ↳ PFOA | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| ↳ PFOS | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| Lead | 2 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ✓ Low |
| Chlorine / Chloramine | 1.1 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 2.24 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Our Top Picks for Roswell (310 PPM)
Hard water at 310 PPM causes scale buildup, increased energy use, and premature appliance failure. A softener protects your plumbing and appliances.
Quick Fix for Chlorine: Shower Filter
At 1.1 mg/L chlorine, many Roswell residents notice dry skin, brittle hair, and that "pool smell" in the shower. A shower filter installs in 5 minutes, no tools needed.
How to Test Your Water in Roswell
With 310 PPM hardness, a quick test strip confirms whether your specific tap matches Roswell's average before you invest in a softener. Hardness can vary within the same system.
Free option: Request City of Roswell Water's annual Consumer Confidence Report for official city-level data.
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About Roswell's Water Supply
Water Utility: City of Roswell Water
Water Source: Roswell Artesian Basin wells (Groundwater)
Population Served: 54,025
Hardness: 310 PPM (18.1 grains per gallon)
Roswell draws its drinking water from groundwater sources — Roswell Artesian Basin wells. Groundwater typically requires less treatment than surface water because the earth acts as a natural filter. The tradeoff: dissolved minerals from underground rock formations, which is why hardness is elevated here. Calcium and magnesium dissolve into the water as it moves through limestone and dolomite. The system serves 54,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request City of Roswell Water's Consumer Confidence Report (CCR) or test your own tap.
ZIP Codes Covered by This Report
This water quality data applies to all areas served by City of Roswell Water in Roswell, NM, including ZIP codes:
88119, 88122, 88136, 88201, 88202, 88203, 88210, 88211, 88213, 88230, 88232, 88250, 88253, 88254, 88301, 88312, 88316, 88318, 88323, 88324, 88336, 88338, 88341, 88343, 88345, 88346, 88348, 88351, 88355
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Water Softener Sizing for Roswell
At 310 PPM (18.1 GPG), here is how to size a softener for your Roswell home. Multiply hardness in GPG (18.1) by daily water usage (roughly 50 gallons per person). A family of four uses about 200 gallons/day: 18.1 GPG × 200 gal = 3620 grains/day. Over a 7-day regeneration cycle, that is 25,340 grains - a 32,000-grain softener is the right fit for most Roswell households.
Compare Roswell to Other New Mexico Cities
Frequently Asked Questions About Roswell Water
Is Roswell tap water safe to drink?
Where does Roswell's water come from?
Do I need a water softener in Roswell?
Does Roswell water damage tankless water heaters?
How much does hard water cost a Roswell household per year?
What is the hardness of Roswell water in grains per gallon?
What size water softener do I need for Roswell?
Salt-based softener or salt-free conditioner for Roswell?
Data sources: Lead and copper data from EPA Safe Drinking Water Act LCR reporting. Contaminant data from utility-reported testing results. PFAS data from EPA UCMR5 (2023–2025). Hardness from USGS and municipal reports. Data reflects system-level testing results and may not match your specific tap due to neighborhood plumbing, season, or recent utility changes. For your utility's latest results, request their Consumer Confidence Report (CCR). Our methodology. Last updated: 2026-02-24.
What Roswell Homeowners Actually Buy
Common purchases for homes with 310 PPM water.
Affiliate disclosure: we may earn a commission. Selection based on Roswell's water data.