How many water violations are in Plymouth County?

Plymouth County has 4,809 total drinking water violations across 129 water systems, of which 514 are health-based violations. 93.0% of systems have at least one violation.

How many people get water from Plymouth County systems?

Water systems in Plymouth County serve approximately 574,062 people through 129 public water systems.

Has PFAS been detected in Plymouth County water?

Under EPA UCMR5, 18 of 24 tested systems in Plymouth County had at least one PFAS detection (75.0% of the UCMR5-tested subset - not of all 129 SDWIS systems).

What types of water sources supply Plymouth County?

Water systems in Plymouth County use GW (117 systems), SW (12 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. 10.7% of Plymouth County's violations are health-based. Among counties with any SDWIS violations, this extract puts Plymouth County in the middle health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

Counties → Massachusetts

Plymouth County, Massachusetts

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet MA023 · Plymouth County 129 sys · 4,809 viol · #123/3254

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

VIOL-SEVERE 93.0% flagged
HEALTH-LOW 10.7% health
RANK-TOP #123/3254
PHOTO-FINISH ±0.0 pp
PFAS-HIGH 75.0% detect
SRC-GW GW lead 91%
SYS-LARGE 129 systems
BOOK-FULL 7/7 fields

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

According to EPA SDWIS county population served used on /counties, Plymouth County ranks #123 of 3,254 counties by people served, and #8 of 14 counties in Massachusetts. See methodology · corpus placement.

Plymouth County standing, mid-flagged corpus third

Flagged-system rate 93.0% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 10.7% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 75.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #123 of 3,254 · #8 of 14 in Massachusetts.

Water Systems

System Name	Population	Violations	PFAS
Brockton Water Department	105,643	110	Clean
Plymouth Water Department	46,799	37	Detected
Weir River Water System	45,339	41	Detected
Marshfield Water Department	34,000	109	Detected
Abington/Rockland Joint Wtr. Works	33,647	48	Detected
Mattapoisett River Valley W.D.	29,600	4	Clean
Bridgewater Water Department	28,633	55	Detected
Wareham Fire District	21,418	38	Clean
Scituate Water Division	19,297	94	Detected
Pembroke Water Division Dpw	18,251	42	Detected
Duxbury Water Department	16,387	22	Detected
Middleborough Water Supply	15,350	32	Detected
Hanover Water Dept	14,984	51	Detected
Whitman Water System	14,837	50	Detected
Kingston Water Department	14,712	86	Clean
East Bridgewater Water Dept	14,526	101	Detected
Norwell Water Department	11,495	27	Detected
Hanson Water Department	9,546	123	Detected
Aquarion Water Company, Pinehills	9,195	1	Detected
West Bridgewater Water Dept	7,856	110	Detected
Mattapoisett Water Department	7,685	20	Clean
Halifax Water Department	7,553	53	Detected
Marion Water Division	5,761	42	Clean
Onset Fire Districtwater Dept.	5,392	72	Detected
Plymouth South High School	2,875	124	-
McI Bridgewater	2,802	33	-
Agawam Springs Water Company	2,380	6	-
Aquarion Water Company	2,267	11	-
Freetown/Lakeville Regional School Dist.	1,991	19	-
V a Boston Healthcare System Brockton	1,500	0	-
Carver High School and Middle School	1,200	18	-
Cranberryacres Jellystone Park	1,000	27	-
Edaville Railroad	1,000	14	-
Plymouth So.elem.sch.	950	41	-
Carver Elementary School	800	83	-
New Hope Chapel	787	0	-
South Meadow Village	750	77	-
Rochester Memorial School	688	18	-
Georgios Pizza	600	59	-
Rocky Mountain Spring Water Vending	500	2	-
Dcr Myles Standish State Forest	500	23	-
Carver Dunkin Donuts	500	48	-
Indianhead Resort	500	30	-
Sandy Pond Campground	500	23	-
Harvest Farm Springs Public Water Supply	500	2	-
Cranberry Village Residents Association	414	23	-
Ericksons Ice Cream Cafe Inc	400	23	-
Ellis Haven	400	29	-
Camp Squanto, Boy Scouts of America	400	88	-
Old Colony Reg.voc.tech. High Sch.	400	15	-

Compare beyond Massachusetts

Mid-flagged peers for Plymouth County

Cross-state counties nearest Plymouth County on flagged-system share (93.0%) and cumulative violation count (4,809). 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

Compiled by PlainWater, Drinking Water Quality Editorial Process · May 15, 2026

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.