County profile · EPA SDWIS + UCMR5
Delaware County, Pennsylvania
23 SDWIS-listed public water systems serve 151,505 people in Delaware County. Violation rates use that full inventory; PFAS rates use only the UCMR5-tested subset.
- 23
- SDWIS water systems Middle third of counties
- 3,592
- Total violations Upper third of counties
- 100.0%
- SDWIS systems w/ a violation Middle third of counties
- 100.0%
- UCMR5 PFAS rate (2 tested) Upper third of counties with tests
SDWIS compliance plate
Sheet PA045 · Delaware County 23 sys · 3,592 viol · #417/3254
VIOL-SEVERE · HEALTH-LOW · RANK-TOP · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-SMALL · BOOK-FULL
- VIOL-SEVERE 100.0% flagged
- HEALTH-LOW 5.7% health
- RANK-TOP #417/3254
- PHOTO-FINISH ±0.0 pp
- PFAS-HIGH 100.0% detect
- SRC-GW GW lead 83%
- SYS-SMALL 23 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Philadelphia County (+ 0 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Delaware County ranks #417 of 3,254 counties by people served, and #22 of 68 counties in Pennsylvania. See methodology · corpus placement.
Delaware County standing, mid-flagged corpus third
Flagged-system rate 100.0% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 5.7% 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 #417 of 3,254 · #22 of 68 in Pennsylvania.
Flagged-rate neighbourhood around Delaware County
Lowest/highest poles plus in-state counties nearest Delaware County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
| System Name | Population | Violations | PFAS |
|---|---|---|---|
| Chester Water Authority | 140,437 | 14 | Detected |
| Veolia Water Bethel | 7,809 | 54 | Detected |
| Chadds Ford Tavern | 500 | 73 | - |
| Jimmy Johns | 500 | 55 | - |
| Malvern Camp at Stonybank | 400 | 63 | - |
| St Cornelius Rcc School Bldg | 300 | 344 | - |
| Brandywine Battlefield St Park | 200 | 82 | - |
| Ashleys Restaurant & Bar | 200 | 58 | - |
| Brinton Manor | 196 | 318 | - |
| Brandywine Summit Camp | 150 | 50 | - |
| Malvern School of Glen Mills | 125 | 356 | - |
| Gradyville Foods Country Deli | 125 | 36 | - |
| Commons at Chadds Ford | 100 | 127 | - |
| Radnor Valley Country Club | 80 | 720 | - |
| Chadds Ford Barn Shops | 63 | 172 | - |
| Kevorkian Building | 60 | 330 | - |
| Pathways | 53 | 227 | - |
| Brinton Suites | 50 | 47 | - |
| Southpoint Homeowners Assoc | 40 | 159 | - |
| The Inn at Grace Winery | 40 | 41 | - |
| St Cornelius Parish Life Ctr | 27 | 57 | - |
| Knights Inn Glen Mills | 25 | 78 | - |
| Primo Refill LLC | 25 | 131 | - |
Compare beyond Pennsylvania
Mid-flagged peers for Delaware County
Cross-state counties nearest Delaware County on flagged-system share (100.0%) and cumulative violation count (3,592). 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.