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Union County, Pennsylvania — public water systems

At a glance

37 active public water systems are filed under Union County, Pennsylvania in EPA's SDWIS records, together reporting 8,788 people served. The largest is Mifflinburg Boro Water Dept, which reports serving 3,690 people. 6 are community water systems serving people where they live; the other 31 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.

Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.

Active systems

37

Population served

8.8K

Community systems

6

Groundwater share

91.9%

How does Union County compare with other Pennsylvania counties?

Union County has the 54th-most active public water systems among the 99 counties listed for active Pennsylvania systems in EPA records; among the 71 with 3 or more systems, the median has 76. Its systems report 8,788 people served in total, the 63rd-largest county figure in the state and less than 0.1% of the statewide total. The average system here reports serving 238 people, well below the Pennsylvania average of 1,741. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.

Where does Union County's drinking water come from?

By primary water source, Union County's active systems draw on groundwater (34, 92%), purchased surface water (2, 5.4%) and surface water (1, 2.7%). Overall, 92% rely mainly on groundwater (including purchased groundwater) and 8.1% on surface water, compared with 93% and 6.8% across Pennsylvania. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Mifflinburg Boro Water Dept, draws primarily on surface water.

What kinds of water systems operate in Union County?

Union County's active systems break down as 6 community systems (16%), 4 non-transient non-community systems (11%) and 27 transient non-community systems (73%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as private (70%), public/private partnership (16%), local government (11%) and state government (2.7%).

Water systems in Union County

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Active public water systems in Union County, Pennsylvania
#Water systemCountyPopulation servedTypeSource
1Mifflinburg Boro Water DeptUnion3,690CommunitySurface water
2New Berlin Municipal AuthorityUnion990CommunityGroundwater
3Hidden Valley Camping ResortUnion600Transient non-communityGroundwater
4Pine Valley Mobile Home CourtUnion425CommunityGroundwater
5R B Winter State ParkUnion400Transient non-communityGroundwater
6Nittany Mountain KoaUnion350Transient non-communityGroundwater
7West Buffalo Twp Mun AuthUnion333CommunityPurchased surface water
8Chilly WillysUnion250Transient non-communityGroundwater
9White Deer Run Treatment CentrUnion226Non-transient non-communityGroundwater
10Limestone Twp Mun AuthUnion200CommunityPurchased surface water
11Camp Mount LutherUnion120Transient non-communityGroundwater
12Creekside Mennonite SchoolUnion100Non-transient non-communityGroundwater
13River Edge CampgroundUnion100Transient non-communityGroundwater
14Shady Grove Christian SchoolUnion90Non-transient non-communityGroundwater
15Wesley Forest CampUnion75Transient non-communityGroundwater
16Penns Creek CampgroundUnion75Transient non-communityGroundwater
17Pik RiteUnion70Non-transient non-communityGroundwater
18Rolling Hills ManorUnion64CommunityGroundwater
19Central Pa Wesleyan CampgroundUnion50Transient non-communityGroundwater
20Forest House HotelUnion50Transient non-communityGroundwater
21Ards MarketUnion50Transient non-communityGroundwater
22Boomerangs Bar & Grille Inc.Union50Transient non-communityGroundwater
23Hidden Creek CampgroundUnion50Transient non-communityGroundwater
24Dc Coffee and Tea CoUnion50Transient non-communityGroundwater
25Union Co Sportsmens ClubUnion30Transient non-communityGroundwater
26Forest Hill General StoreUnion25Transient non-communityGroundwater
27The Purple CowUnion25Transient non-communityGroundwater
28Get and Go LLCUnion25Transient non-communityGroundwater
29Harveys Food MartUnion25Transient non-communityGroundwater
30Old Saw Mill CampgroundUnion25Transient non-communityGroundwater
31Camp Karoondinha B S AUnion25Transient non-communityGroundwater
32Sunsational Family CampUnion25Transient non-communityGroundwater
33La PrimaveraUnion25Transient non-communityGroundwater
34Buffalo Valley Sportsmens AssnUnion25Transient non-communityGroundwater
35HarveysUnion25Transient non-communityGroundwater
36Yoder Zimmerman Vfw Post 1964Union25Transient non-communityGroundwater
37West End Social ClubUnion25Transient non-communityGroundwater

Union County water systems: frequently asked questions

How many public water systems are in Union County, Pennsylvania?

EPA's SDWIS records file 37 active public water systems under Union County, Pennsylvania: 6 community systems (16%), 4 non-transient non-community systems (11%) and 27 transient non-community systems (73%).

Who supplies drinking water in Union County, PA?

The largest community water systems filed under Union County are Mifflinburg Boro Water Dept (3,690 people served), New Berlin Municipal Authority (990 people served) and Pine Valley Mobile Home Court (425 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.

Does Union County's drinking water come from groundwater or surface water?

Of the 37 active public water systems in Union County, 92% draw mainly on groundwater and 8.1% on surface water, counting purchased supplies. The largest system, Mifflinburg Boro Water Dept, uses surface water.

Where can I find a water quality report for Union County?

Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 6 community systems are filed under Union County, so the report to look for is the one from the system that supplies your address.

How can I check violations for a water system in Union County?

Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.

More Pennsylvania water systems

About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “Public water systems in Union County, Pennsylvania”, https://aquacensus.com/water-systems/pennsylvania/union (data as of October 1, 2026).