Check Your Water Hardness

Find a city reference, confirm your supplier and decide whether you need a tap-water test.

City references for 12 cities in the Las Vegas and Phoenix metro areas. ZIP codes can cross utility boundaries.

Find a possible water supplier

If you are at the property, use your location to check EPA service-area boundaries. Some boundaries are modeled; confirm the supplier on your bill.

Only when you select the button: your browser asks for location permission, then coordinates are sent through this site to EPA's map service. We do not include them in analytics.