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Counties → Pennsylvania

Dauphin County, Pennsylvania

SDWIS compliance plate

Sheet PA043 · Dauphin County 145 sys · 21,033 viol · #242/3254

VIOL-SEVERE · HEALTH-LOW · RANK-TOP · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-LARGE · BOOK-FULL

  • VIOL-SEVERE 98.6% flagged
  • HEALTH-LOW 4.7% health
  • RANK-TOP #242/3254
  • PHOTO-FINISH ±0.1 pp
  • PFAS-HIGH 57.1% detect
  • SRC-GW GW lead 94%
  • SYS-LARGE 145 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Chester County ( -0.1 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Dauphin County ranks #242 of 3,254 counties by people served, and #13 of 68 counties in Pennsylvania. See methodology · corpus placement.

Dauphin County standing, mid-flagged corpus third

Flagged-system rate 98.6% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 4.7% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 57.1% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #242 of 3,254 · #13 of 68 in Pennsylvania.

Flagged-rate neighbourhood around Dauphin County

Lowest/highest poles plus in-state counties nearest Dauphin County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Greene · lowest Chester · near Luzerne · near Sullivan · highest 66.7% 98.6% 98.6% 98.8% 98.8% 98.9% 100%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

Water Systems

System Name Population Violations PFAS
Veolia Water 110,000 136 Detected
Capital Region Water 66,540 145 Clean
PA Amer Water Co 50,200 15 Detected
Veolia Middletown 9,600 341 Detected
PA American Water Steelton 6,428 226 Clean
Penn National Gaming 6,000 102 Clean
Millersburg Water Auth 4,600 221 Detected
Lykens Boro Auth 3,220 632 -
Elizabethville Area Auth 2,700 227 -
Williamstown Boro Auth 2,390 325 -
Halifax Area Water & Sewer Aut 2,278 167 -
Rutters Farm Store 77 1,600 212 -
Harrisburg Intl Airport 1,500 268 -
Rutters Farm Store #20 1,200 16 -
Sheetz 461 1,100 87 -
Royalton Boro 1,083 53 -
Grantville MHP 1,040 745 -
PA DOT Site 47 Mod Rest Area 1,000 104 -
PA DOT Site 48 Mod Rest Area 1,000 32 -
Pilot Travel Ctr No 517 980 98 -
Sheetz Grantville 900 6 -
Thermo Fisher Scientific 800 30 -
Upper Dauphin Middle Sch 779 119 -
Gratz Boro Water Revenue Fund 738 356 -
Mainstay Suites 700 40 -
Middletown Anglers & Hunters 600 72 -
Holiday Inn Grantville 500 441 -
Funcks Exxon 500 39 -
Londonderry Elem Sch 465 373 -
Harrisburg Christian Sch 450 172 -
East Hanover Elem Sch 440 176 -
Cedar Manor MHP 432 1,357 -
Oak Knoll Est MHP 350 491 -
Pillow Boro Auth 312 191 -
Pine Manor MHP 302 202 -
Lykens Valley Golf Course 300 26 -
Sunset Gc 300 65 -
Red Rabbit Drive IN 300 53 -
Tmi Plt Drinking Water Sys 300 17 -
Northern Dauphin Co YMCA 300 70 -
Halifax Village 272 1,131 -
Devonshire Mem United Breth Ch 260 80 -
Conewago Twp Elem Sch 250 166 -
Hampton Inn 240 50 -
Crestview Village MHP 223 426 -
Camp Small Valley Hemlock Gsc 220 69 -
St Johns Luth Ch 200 164 -
Holiday Inn Express 200 21 -
Kingdom Hall Jehovahs Witness 200 42 -
Yellow Breeches Ed Center 200 71 -

Compare beyond Pennsylvania

Mid-flagged peers for Dauphin County

Cross-state counties nearest Dauphin County on flagged-system share (98.6%) and cumulative violation count (21,033). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.