PlainWater
Counties → Pennsylvania

Chester County, Pennsylvania

Water Systems
276
Population Served
302,878
Total Violations
47,248
2,339 health-based
PFAS Detected
11
of 11 tested

Violation Analysis

98.6%
Systems with Violations
171.2
Avg Violations per System
5.0%
Health-Based Violations

Water Source Types

GW
35 systems (13%)
SW
15 systems (5%)

PFAS Contamination

11
Systems Tested
11
PFAS Detected
100.0%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Chester Pennsylvania water systems by violation status, EPA SDWIS records.

No violations on record (1) One or more violations (49)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Aqua PA West Chester 48,600 188 Detected
PA American Royersford 46,847 146 Detected
PA American Coatesville 36,960 81 Detected
Aqua PA Uwchlan 35,518 237 Detected
Phoenixville Water Dept 16,599 502 Detected
Downingtown Water Authority 9,900 248 Detected
Aqua PA Friendship 8,800 216 Detected
Aqua PA Spring Run 8,151 395 Detected
Kennett Square Mun Water Works 6,328 653 Detected
Oxford Borough 5,280 349 Detected
London Grove Twp Mun Auth 4,770 117 Detected
Octorara Area School District 3,100 205 -
Wawa Food Market 289 2,925 18 -
North Coventry Water System 2,907 132 -
Honey Brook Boro Water 2,892 520 -
West Grove Borough 2,873 429 -
PA American Phoenixville 2,661 7 -
Coatesville Veterans Adm Hosp 2,000 292 -
Ojrsd Owen J Roberts MS and Hs 1,750 196 -
Elverson Water Company 1,641 322 -
Marsh Creek State Park 1,630 108 -
Aqua PA Honeybrook 1,600 39 -
Wawa Food Store #88 1,425 38 -
Borough of Atglen 1,406 146 -
Turkey Hill Minit Market #82 1,400 89 -
Borough of Avondale 1,108 420 -
Peter J. Camiel Service Plaza 1,100 247 -
Loch Nairn Farm 1,000 114 -
Tel Hai Retirement Community 930 118 -
Ridglea 900 367 -
Turkey Hill #168 900 48 -
Westtown School 900 651 -
Ojrsd French Creek Elem Sch 700 357 -
Aqua PA East Pikeland 675 0 -
Brandywine Wallace Elem 600 264 -
Springton Manor Elementary 600 75 -
Indian Run Village MHP 550 121 -
Avon Grove Charter School 549 128 -
Ojrsd E Vincent Elem School 538 12 -
Ojrsd N Coventry Elem School 530 9 -
Camp Saginaw 530 47 -
Casd Kings Highway Elem Sch 521 268 -
Turkey Hill Minit Market #177 500 2 -
Aqua PA Superior Suburbia Ctr 500 1,174 -
Willowdale Town Center 500 166 -
Chadds Ford Elementary School 500 278 -
Chaddsford Winery 500 12 -
Nottingham Manor M H Court 473 3,266 -
Appleville Mobile Home Park 461 899 -
Spring Run Estates WTP 450 87 -

Other Counties in Pennsylvania

Allegheny County
69 systems · 2,014,752 served · 5,241 violations
Philadelphia County
6 systems · 1,601,175 served · 447 violations
Montgomery County
172 systems · 1,274,688 served · 36,032 violations
Bucks County
299 systems · 599,107 served · 59,577 violations
Lancaster County
434 systems · 406,457 served · 39,193 violations
York County
208 systems · 389,602 served · 25,528 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Chester County? ▼
Chester County has 47,248 total drinking water violations across 276 water systems, of which 2,339 are health-based violations. 98.6% of systems have at least one violation.
How many people get water from Chester County systems? ▼
Water systems in Chester County serve approximately 302,878 people through 276 public water systems.
Has PFAS been detected in Chester County water? ▼
Of 11 water systems tested for PFAS in Chester County, 11 had PFAS detected (100.0% detection rate).
What types of water sources supply Chester County? ▼
Water systems in Chester County use GW (35 systems), SW (15 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 5.0% of Chester County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Read our methodology - 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 Editorial

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.