How hard is the water in Santa Fe, NM?

Tap water hardness
70mg/L
4.1gpg
Moderately hard

Reported by Santa Fe Water System (City Of) · September 2025

NM typical
137 mg/L
EPA health violations since 2016
1
Softener for 3 people
24k grain
Data
Utility report

Santa Fe water measures 70 mg/L (4.1 gpg) of hardness, moderately hard by USGS standards. The number comes from Santa Fe Water System (City Of), dated September 2025.

Santa Fe on the hardness scale, with nearby cities
060120180240300360+NM typical 137Gallup: 17 mg/LGallup 17Rio Rancho: 107 mg/LRio Rancho 107North Valley: 137 mg/LNorth Valley 137Los Ranchos de Albuquerque: 137 mg/LLos Ranchos de Albuquerque 137Albuquerque: 137 mg/LAlbuquerque 137South Valley: 137 mg/LSouth Valley 137Las Vegas: 140 mg/LLas Vegas 140Ruidoso: 169 mg/LRuidoso 169Farmington: 256 mg/LFarmington 256Clovis: 258 mg/LClovis 258Santa Fe 70mg/L as calcium carbonate060120180240300360+NM 137Rio Rancho: 107 mg/LRio Rancho 107North Valley: 137 mg/LNorth Vall. 137Los Ranchos de Albuquerque: 137 mg/LLos Rancho. 137Albuquerque: 137 mg/LAlbuquerque 137South Valley: 137 mg/LSouth Vall. 137Las Vegas: 140 mg/LLas Vegas 14070 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 70 mg/L, Santa Fe is 67 mg/L below the typical New Mexico figure of 137. Of the 10 nearest cities we track, 1 has softer water and 9 have harder. The range nearby runs from 17 mg/L in Gallup to 258 in Clovis.

What 70 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.

What to do about it

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Santa Fe

3 people × 75 gallons a day × 4.1 gpg = 925 grains a day. A 24,000-grain unit regenerates about every 25 days.

Size it for your household

EPA record for Santa Fe's water system

Santa Fe Water System (City Of) · PWSID NM3505126

1 health-based violation since 2016

Serves about 90,810 people from surface water.

Health-based
1
Monitoring or reporting
9
Open now
0
20162017201820192020202120222023202420252026Lead and Copper Rule'16'18'20'22'24'26Lead and Copper Rule
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Lead and Copper Rulecorrosion control and lead sampling12024Resolved

Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.

Questions

Is Santa Fe water hard?

Somewhat. It measures about 70 mg/L (4.1 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Santa Fe in grains per gallon?

About 4.1 gpg. One grain per gallon equals 17.1 mg/L, so 70 mg/L divided by 17.1 gives 4.1.

What size water softener do I need in Santa Fe?

For 3 people using 75 gallons each per day, 4.1 gpg works out to about 925 grains a day. A 24,000-grain softener covers that with a regeneration about every 25 days.

Has the Santa Fe water system had EPA violations?

EPA records show 1 health-based violation for Santa Fe Water System (City Of) since 2016, involving Lead and Copper Rule. There were also 9 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 13 cities in New Mexico

Hardness data: TapWaterData US Water Hardness (utility report, September 29, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.