<p>In New York, mains water is delivered by local public water systems, regulated by the New York State Dept of Health (NYSDOH), Bureau of Water Supply Protection under the US EPA Safe Drinking Water Act. Typical hardness: Highly variable; soft in NYC (Catskill/Delaware), Adirondacks and Catskills; moderately hard to very hard across central/western NY limestone. For a specific ZIP, see the EWG Tap Water Database.</p>
Sources: New York State Dept of Health (NYSDOH), Bureau of Water Supply Protection, EWG Tap Water Database