How many water violations are in Norfolk County?

Norfolk County has 2,645 total drinking water violations across 57 water systems, of which 480 are health-based violations. 93.0% of systems have at least one violation.

How many people get water from Norfolk County systems?

Water systems in Norfolk County serve approximately 842,114 people through 57 public water systems.

Has PFAS been detected in Norfolk County water?

Under EPA UCMR5, 22 of 27 tested systems in Norfolk County had at least one PFAS detection (81.5% of the UCMR5-tested subset - not of all 57 SDWIS systems).

What types of water sources supply Norfolk County?

Water systems in Norfolk County use GW (35 systems), SW (22 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. 18.1% of Norfolk County's violations are health-based. Among counties with any SDWIS violations, this extract puts Norfolk County in the middle health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

Counties → Massachusetts

Norfolk County, Massachusetts

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet MA021 · Norfolk County 57 sys · 2,645 viol · #74/3254

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

VIOL-SEVERE 93.0% flagged
HEALTH-LOW 18.1% health
RANK-TOP #74/3254
PHOTO-FINISH ±0.0 pp
PFAS-HIGH 81.5% detect
SRC-GW GW lead 61%
SYS-MID 57 systems
BOOK-FULL 7/7 fields

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

According to EPA SDWIS county population served used on /counties, Norfolk County ranks #74 of 3,254 counties by people served, and #4 of 14 counties in Massachusetts. See methodology · corpus placement.

Norfolk 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 18.1% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 81.5% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #74 of 3,254 · #4 of 14 in Massachusetts.

Water Systems

System Name	Population	Violations	PFAS
Quincy Water Dept. (Mwra)	106,000	14	Clean
Brookline Water and Sewer Division	63,191	16	Clean
Weymouth Water Department	57,613	50	Detected
Randolph/Holbrook Joint Water Board	45,767	16	-
Dedham Westwood Water Dist.	41,630	11	Detected
Braintree Water and Sewer Dept.	39,143	98	Detected
Randolph Water Department	34,362	27	Detected
Bluedrop Water @ Randolph Dpw	34,362	7	-
Bluedrop Water @ St Bernadette Church	34,362	0	-
Franklin Water Department	33,399	44	Detected
Needham Water Dept	33,130	118	Detected
Norwood Water Dept. (Mwra)	29,909	25	Clean
Wellesley Water Division	29,550	15	Detected
Stoughton Water Department	29,281	45	Detected
Milton Water Dept. (Mwra)	28,630	13	Clean
Walpole Water Dept	24,070	67	Detected
Canton Water Dept	22,453	38	Detected
Foxboro Water Department	18,639	100	Detected
Sharon Water Dept	16,991	13	Detected
Bellingham Dpw Water Sewer Division	16,061	78	Detected
Medway Water Department	13,115	370	Detected
Medfield Water Dept.	12,894	135	Detected
Wrentham Water Division	11,795	125	Detected
Holbrook Public Works Dept	11,405	47	Detected
Millis Water Dept	9,002	98	Detected
Plainville Water Department	8,805	62	Detected
Norfolk Water Division	7,602	327	Detected
Cohasset Water Dept	7,555	64	Detected
Town of Avon	4,777	92	Detected
Wellesley College	3,000	33	-
Hale Education, Inc.	3,000	5	-
McI Norfolk/Cedar Junction/Walpole	2,200	19	Clean
Aquarion Water Company (Dover)	1,922	43	-
Southfield Redevelopement Authority	1,800	1	-
Blue Hills Spring Water	1,500	0	-
Wrentham Developmental Center	937	22	-
Dover Water Dept	500	86	-
Old Colony YMCA Stoughton	475	13	-
Wentworth Hills Golf Club	250	9	-
Camp Haiastan	200	35	-
Glen Ridge Residents Trust	135	28	-
Aquarion Water Co. (Springdale Farms)	126	34	-
Powisset Farm	100	4	-
Mount St Marys Abbey	60	90	-
Meadowbrook Water Trust	57	26	-
Bishops Landing Condominiums	50	25	-
Precious Beginnings	44	2	-
Old Farm Road Water Trust	40	42	-
Primo Water @ Wal Mart #2122	25	2	-
Tri Town Water Board	25	2	-

Compare beyond Massachusetts

Mid-flagged peers for Norfolk County

Cross-state counties nearest Norfolk County on flagged-system share (93.0%) and cumulative violation count (2,645). 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.