County profile · EPA SDWIS + UCMR5
Armstrong County, Pennsylvania
42 SDWIS-listed public water systems serve 47,549 people in Armstrong County. Violation rates use that full inventory; PFAS rates use only the UCMR5-tested subset.
- 42
- SDWIS water systems Larger third of counties
- 4,905
- Total violations Upper third of counties
- 97.6%
- SDWIS systems w/ a violation Middle third of counties
- 0.0%
- UCMR5 PFAS rate (5 tested) Lower third of counties with tests
SDWIS compliance plate
Sheet PA005 · Armstrong County 42 sys · 4,905 viol · #985/3254
VIOL-SEVERE · HEALTH-LOW · RANK-UPPER · PHOTO-FINISH · PFAS-CLEAN · SRC-GW · SYS-MID · BOOK-FULL
- VIOL-SEVERE 97.6% flagged
- HEALTH-LOW 10.9% health
- RANK-UPPER #985/3254
- PHOTO-FINISH ±0.0 pp
- PFAS-CLEAN 0.0% detect
- SRC-GW GW lead 79%
- SYS-MID 42 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Tioga County (+ 0 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Armstrong County ranks #985 of 3,254 counties by people served, and #41 of 68 counties in Pennsylvania. See methodology · corpus placement.
Armstrong County standing, mid-flagged corpus third
Flagged-system rate 97.6% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 10.9% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #985 of 3,254 · #41 of 68 in Pennsylvania.
Flagged-rate neighbourhood around Armstrong County
Lowest/highest poles plus in-state counties nearest Armstrong County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
Compare beyond Pennsylvania
Mid-flagged peers for Armstrong County
Cross-state counties nearest Armstrong County on flagged-system share (97.6%) and cumulative violation count (4,905). 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.
Similar violation load
Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).
Read our methodology · Check your water system - how this data is sourced, computed, and verified.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.