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Counties → North Carolina

Johnston County, North Carolina

SDWIS compliance plate

Sheet NC101 · Johnston County 54 sys · 7,155 viol · #333/3254

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

  • VIOL-SEVERE 94.4% flagged
  • HEALTH-LOW 10.3% health
  • RANK-TOP #333/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-HIGH 100.0% detect
  • SRC-GW GW lead 59%
  • SYS-MID 54 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Hoke County (+ 0 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Johnston County ranks #333 of 3,254 counties by people served, and #13 of 100 counties in North Carolina. See methodology · corpus placement.

Johnston County standing, mid-flagged corpus third

Flagged-system rate 94.4% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 10.3% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 100.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #333 of 3,254 · #13 of 100 in North Carolina.

Flagged-rate neighbourhood around Johnston County

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

0% 20% 40% 60% 80% 100% Gates · lowest Hoke · near Caswell · near Tyrrell · highest 50% 94.4% 94.4% 94.4% 94.4% 94.7% 100%

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

Water Systems

System Name Population Violations PFAS
Johnston Co-West 92,365 20 Detected
Clayton, Town Of 29,689 121 Detected
Johnston Co-East 22,967 3 Detected
Smithfield, Town Of 12,900 238 Detected
Flowers Plantation 11,643 45 Detected
Selma, Town Of 6,190 190 Detected
Town of Clayton - North 4,523 5 -
Benson, Town Of 4,293 64 Detected
Four Oaks, Town Of 2,854 159 -
Pine Level, Town Of 2,413 425 -
Kenly, Town Of 2,301 223 -
Princeton, Town Of 1,326 207 -
Winston Pointe S/D 1,326 0 -
Smithfield South Water Dist 803 23 -
Buffalo Creek S/D 721 73 -
Southhills Southwoods SD 716 181 -
Selma, Town of (County Line) 642 43 Detected
Riverwood S/D 553 12 -
White Oak Plantation 521 74 -
Creekstone S/D 505 9 -
Micro, Town Of 470 764 -
Willowbrook Development 432 100 -
Creekside Place S/D 361 8 -
South Plantation S/D 357 7 -
Ole Mill Stream S/D 325 6 -
Stephanie Woods S/D 245 10 -
Pine Level, Town of (Firetower) 238 238 -
Winston Plantation 229 0 -
Tucker Lake 200 93 -
Neuse Colony S/D Section B 190 56 -
Dutchess Downs Mh S/D 185 151 -
Southgate S/D 160 56 Detected
Country Hills S/D 152 112 -
Tippetts Chapel Fwb Church 130 136 -
Southfort S/D 125 3 -
Deerfield S/D 120 6 -
Garner Estates Mh S/D 114 130 -
Heather Downs Mh S/D 112 13 -
Cleveland MHP 107 654 -
Micro, Town of (County Line) 107 245 -
Smithfield Moose Lodge 100 89 -
Shadow Lakes S/D 99 3 -
Albany Acres S/D 81 6 -
Stoneybrook Estates S/D 80 35 -
Adams MHP 80 1,585 -
Gibson Glen S/D 60 3 -
Neighbor`s Walk S/D 60 0 -
Paceville S/D 58 137 -
Clemmons State Forest 50 34 -
Heatherstone S/D 48 6 -

Compare beyond North Carolina

Mid-flagged peers for Johnston County

Cross-state counties nearest Johnston County on flagged-system share (94.4%) and cumulative violation count (7,155). 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.