How many water violations are in Penobscot County?

Penobscot County has 15,780 total drinking water violations across 168 water systems, of which 2,204 are health-based violations. 93.5% of systems have at least one violation.

How many people get water from Penobscot County systems?

Water systems in Penobscot County serve approximately 92,443 people through 168 public water systems.

Has PFAS been detected in Penobscot County water?

Under EPA UCMR5, 0 of 6 tested systems in Penobscot County had at least one PFAS detection (0.0% of the UCMR5-tested subset - not of all 168 SDWIS systems).

What types of water sources supply Penobscot County?

Water systems in Penobscot County use GW (162 systems), SW (6 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. 14.0% of Penobscot County's violations are health-based. Among counties with any SDWIS violations, this extract puts Penobscot County in the middle health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

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

According to EPA SDWIS county population served used on /counties, Penobscot County ranks #613 of 3,254 counties by people served, and #3 of 16 counties in Maine. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → Maine

Penobscot County, Maine

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet ME019 · Penobscot County 168 sys · 15,780 viol · #613/3254

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

VIOL-SEVERE 93.5% flagged
HEALTH-LOW 14.0% health
RANK-TOP #613/3254
PHOTO-FINISH ±0.6 pp
PFAS-CLEAN 0.0% detect
SRC-GW GW lead 96%
SYS-LARGE 168 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Oxford County (+ 0.6 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Penobscot County ranks #613 of 3,254 counties by people served, and #3 of 16 counties in Maine. See methodology · corpus placement.

Penobscot County standing, mid-flagged corpus third

Flagged-system rate 93.5% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 14.0% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #613 of 3,254 · #3 of 16 in Maine.

Water Systems

System Name	Population	Violations	PFAS
Bangor Water District	27,298	8	Clean
Brewer Water Department	8,860	23	Clean
Old Town Water District	7,648	12	Clean
Orono-Veazie Water District	5,793	56	Clean
Maine Water Company Millinocket Division	5,400	30	Clean
Hampden Water District	4,628	14	Clean
Lincoln Water District	3,020	21	-
Dexter Utility District	2,338	38	-
East Millinocket Water Works	2,133	20	-
Newport Water District	1,900	375	-
Howland Water Department	1,025	40	-
Rsu 64 Central Middle & High School	615	68	-
Knifes Edge Brewing	604	42	-
Rsu 64 Central Community Elementary	550	37	-
Hermon High School	550	117	-
Glenburn Elem School	528	24	-
Mountain View Correctional Facility	468	47	-
Conley Events LLC	467	210	-
Center Drive School	450	266	-
Patricia a Duran School	430	99	-
Ksr-Camp Roosevelt	400	87	-
Cedar Haven Mhc	395	157	-
Hermon Middle School #2	350	69	-
Patten Water Dept	338	33	-
Pleasant Hill Campground	333	48	-
Big Moose Inn & Cabins/Cg	305	7	-
KOA Bangor RV LLC	300	58	-
Lee Academy #3	300	30	-
Anglers Restaurant	297	87	-
Pushaw Lake Campground	289	83	-
Moosehead Trail Campground	277	17	-
Lee Academy-Cobb Center	270	16	-
Msad 31 Enfield Station Elementary	266	34	-
Wilderness Edge Campground	258	19	-
Lee Academy #1	252	31	-
Rsu 63 Holbrook School	250	20	-
Katahdin Shadows Campground	250	13	-
Rsu 87 Suzanne M Smith Elem School	249	109	-
Rsu 87 Caravel Middle School	243	124	-
Cold River Campground	228	172	-
Twin Pine Camps LLC	225	29	-
Rsu 89 Katahdin Elementary	220	44	-
Paul Bunyan Campground	220	41	-
Pumpkin Patch RV Resort	213	25	-
Lakeshore Restaurant	210	48	-
Parks Pond Campground	202	38	-
Rsu 87 Carmel Elementary School	201	154	-
Cn Brown-Big Apple-Corinna #1077	200	124	-
Camp Pierce Webber-Upper	195	61	-
Shin Pond Pub LLC	195	241	-

Compare beyond Maine

Mid-flagged peers for Penobscot County

Cross-state counties nearest Penobscot County on flagged-system share (93.5%) and cumulative violation count (15,780). 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.