ZIP 78588
Water quality in San Isidro, TX (78588)
Drinking water in ZIP 78588 (San Isidro, Starr County) comes from 9 public water system s on EPA's records. The list below is ranked by population served: the largest regional authority for your area appears first, smaller subdivisions and private systems below.
Combined population served: 69,479 people.
Public water systems serving ZIP 78588
Ranked by population served. Tier badges show how EPA records each utility's service area: "Serves your city" means EPA's geographic-areas table specifically lists San Isidro; "Serves your county" means the utility serves Starr County (regional authorities are usually filed this way); "Billing address at this ZIP" means the utility files paperwork from this ZIP but EPA does not confirm it serves you.
- Serves your county
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How we matched ZIP 78588: we translate the ZIP to a city and county via the Geonames postal database, then match against service-area cities and counties EPA has on file for each public water system. EPA does not publish authoritative service-area boundary maps for most systems, so there is still some guesswork; large regional authorities (e.g., county-wide water and sewer authorities) are usually filed at the county level even when they serve specific cities. Your water bill names the authoritative utility. Methodology.