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ZIP Code 84321 Water Quality
Montana · 2,283 people served · 3 water systems
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ExcellentZIP code 84321 is in Montana and is a small town from a drinking-water-service perspective, with 2,283 people served by 3 EPA-registered public water systems. It overlaps with 2 communities including LOGAN, RIVER HEIGHTS.
Within ZIP code 84321, the EPA Safe Drinking Water Information System (SDWIS) records no health-based Maximum Contaminant Level (MCL) exceedances during the past five years across the 3 water systems serving this postal area.
Last updated: 2026-05-18 · Source: EPA SDWIS
ZIP Code Location
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Cities in ZIP 84321
Water Systems Serving 84321
About ZIP-code water data
Postal-code level water quality data is built up from the underlying water systems — multiple ZIPs may share a single utility, and a single ZIP can span multiple utilities. For property-level information, contact the specific utility serving your address. EPA data on this page was last refreshed on 2026-05-18.
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