How many water violations are in Putnam County?

Putnam County has 11,371 total drinking water violations across 383 water systems, of which 638 are health-based violations. 88.0% of systems have at least one violation.

How many people get water from Putnam County systems?

Water systems in Putnam County serve approximately 57,728 people through 383 public water systems.

Has PFAS been detected in Putnam County water?

Under EPA UCMR5, 0 of 2 tested systems in Putnam County had at least one PFAS detection (0.0% of the UCMR5-tested subset - not of all 383 SDWIS systems).

What types of water sources supply Putnam County?

Water systems in Putnam County use GW (376 systems), SW (7 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. 5.6% of Putnam County's violations are health-based. Among counties with any SDWIS violations, this extract puts Putnam County in the lower health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

Where does Putnam County sit among U.S. counties for water-system population?

According to EPA SDWIS county population served used on /counties, Putnam County ranks #872 of 3,254 counties by people served, and #35 of 58 counties in New York. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → New York

Putnam County, New York

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet NY079 · Putnam County 383 sys · 11,371 viol · #872/3254

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

VIOL-SEVERE 88.0% flagged
HEALTH-LOW 5.6% health
RANK-UPPER #872/3254
PHOTO-FINISH ±0.2 pp
PFAS-CLEAN 0.0% detect
SRC-GW GW lead 98%
SYS-LARGE 383 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Lewis County (+ 0.2 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Putnam County ranks #872 of 3,254 counties by people served, and #35 of 58 counties in New York. See methodology · corpus placement.

Putnam County standing, lower-flagged corpus third

Flagged-system rate 88.0% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 5.6% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #872 of 3,254 · #35 of 58 in New York.

Water Systems

System Name	Population	Violations	PFAS
Carmel WD 2	5,000	52	Clean
Mahopac School Complex (Falls, Mms, Mhs)	3,200	4	-
Cold Spring Village	2,666	70	-
Brewster Village	2,162	19	-
Continental Village WD	1,509	3	-
Mount Ebo WS	1,500	15	-
Carmel WD 3	1,350	20	-
Brewster Heights	1,350	28	-
Watchtower Bible Tract Society	1,251	0	-
Mahopac Water Co	1,202	21	-
Carmel WD 8	1,000	45	-
Chuang Yen Monastery Great Buddha Hall	1,000	0	-
Hill Sparrow Master HOA	938	92	-
Hunters Glen Condominium WS	875	55	-
Reed Farm Condominiums W.S.	600	2	-
Vails Grove Cooperative	500	15	-
Blackberry Hill	500	7	-
Fahnestock Pelton	500	37	-
Green Chimneys: Main Well	500	11	-
Fox Run Condominiums	475	77	-
Peaceable Hill Water District	475	1	-
Carmel WD 4	450	87	-
Chateau Ridge	440	18	-
Rainbow Water	432	7	-
Carmel WD 9	400	32	-
Floradan Lodge	400	39	-
Carmel WD 14	400	6	-
Hillcrest Water District	400	30	-
George Fisher Middle School	400	7	-
Carmel Recreation	400	18	-
Camp Wilbur Herrlich	400	18	-
Maple Hill Condominium W.S.	380	3	-
Boniville Water Co	376	11	-
Kent WD 1	360	3	-
Graymoor Village	350	21	-
Misty Hills Water System	315	74	-
Garrison Union Free School	300	25	-
The Trail Club	300	70	-
Carmel WD 7	300	37	-
Putnam Valley Elementary Sch	300	112	-
Matthew Paterson Elementary School	300	4	-
Lakeview Elementary School	300	0	-
Austin Road Elementary School	300	0	-
Fulmar Road Elementary School	300	0	-
Putnam Valley Professional Building	300	9	-
Drewville Mart, Inc.	300	0	-
Carmel WD 12	300	25	-
Brewster Business Park	300	4	-
Starr Ridge Manor	295	29	-
West Branch Acres	292	18	-

Compare beyond New York

Lower-flagged peers for Putnam County

Cross-state counties nearest Putnam County on flagged-system share (88.0%) and cumulative violation count (11,371). 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.