Water hardness by state
How hard is the water in Oaxaca?
Tap water in Oaxaca averages 18.9 grains per gallon (323 ppm calcium carbonate). That number determines how fast limescale coats your water heater, shower glass and appliances.
Sur la base de 21 mesures issues de 13 points de surveillance, 2021 → 2024.
What 18.9 gpg means in Oaxaca
This is hard water: visible scale on fixtures within weeks, clogged shower heads, stiff laundry and a water heater working overtime. Anti-scale protection is strongly recommended.
What it does to your home
Water heater: even a thin layer of scale insulates the heating element and drives energy use up.
Appliances: dishwashers, washing machines and coffee makers scale up and fail years early.
Fixtures and skin: white spots on faucets and glass, dry skin and dull hair after every shower.
Comment cette valeur a été obtenue
Mediana de 21 monitoreos de dureza total (DUR_TOT, mg/L CaCO3) en 13 sitios de agua subterránea de la RENAMECA (CONAGUA), 2021-2024. El abastecimiento mexicano proviene mayoritariamente de acuíferos — valor indicativo del recurso, no de cada red municipal.
CONAGUA — RENAMECA, Resultados de calidad del agua subterránea (consolidado 2012-2025)Statewide average — hardness varies by utility and season. Always verify with your local water quality report.
Frequently asked questions — Oaxaca
Is 18.9 gpg considered hard water?
On the US scale, 0–3.5 gpg is soft, 3.5–7 gpg moderately hard, 7–10.5 gpg hard and above 10.5 gpg very hard. At 18.9 gpg (323 ppm), water in Oaxaca is classified as Hard water.
Does Oaxaca have a limescale problem?
Water in Oaxaca averages 18.9 gpg — Hard water. The harder the water, the faster calcium carbonate deposits build up in water heaters, appliances and pipes. Below 3.5 gpg the risk is minimal; above 7 gpg scale becomes a running cost.
How do I find the exact water hardness at my address in Oaxaca?
Check your utility's annual water quality report (Consumer Confidence Report) or your water bill, or use our free interactive hardness map. Hardness can vary widely between neighboring utilities in Oaxaca.
Do I need a salt-based water softener at 18.9 gpg?
Not necessarily. Salt softeners add sodium to your water and need constant refills. LIMPEO treats limescale with an electromagnetic field — no salt, no chemicals, no maintenance — and keeps healthy minerals in your drinking water.