What is the largest chlorine disinfection plant in Maine?

Bangor Wastewater Treatment Facility in Bangor, treating about 4.38 MGD under NPDES permit ME0100781.

How are plants with chlorine disinfection identified?

From two sources: treatment structures counted in Klarifi’s review of aerial imagery (lagoons, clarifiers, oxidation ditches, digester silos and gas holders) and the unit processes each plant reports to the EPA Clean Watersheds Needs Survey. A plant is listed when either source records the technology.

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Chlorine disinfection: wastewater treatment plants in Maine

Name: Chlorine disinfection wastewater treatment plants in Maine
Creator: Klarifi
License: https://klarifi.io/terms-of-service

45 plants · 54% of the state · 16 MGD reported by 42 plants

Klarifi identifies 45 publicly owned wastewater treatment plants with chlorine disinfection in Maine, 54% of the 84 plants in the state (16 MGD reported by 42 plants). The largest is Bangor Wastewater Treatment Facility in Bangor at 4.38 MGD.

Chlorine or chloramine disinfection, often followed by dechlorination before discharge, remains the most common effluent disinfection in the United States. Plants on gas chlorine are candidates for conversion to hypochlorite or UV, a recurring capital project driven by safety rules and permit limits on residual chlorine.

Chlorine disinfection plants nationwide →All plants in Maine →Largest plants in Maine →

The largest plants with chlorine disinfection in Maine

The 25 largest plants with chlorine disinfection in Maine by average flow, with permit expiry and three-year violation count.
#	Facility	City	Avg flow (MGD)	NPDES permit	Expires	Violations (3y)
1	Bangor Wastewater Treatment Facility	Bangor	4.38	ME0100781	Jul 2031	14
2	Westbrook Waste Water Treatmemt Facility	Westbrook	2.5	ME0100846	Jul 2022	26
3	Old Orchard Beach Wastewater Treatment Facility	Old Orchard Beach	0.9	ME0101524	May 2020	11
4	Bar Harbor WWTF Main Facility	Bar Harbor	0.82	ME0101214	Jan 2021	9
5	Falmouth Waste Water Treatment Facility	Falmouth	0.7	ME0100218	Dec 2023	3
6	York Wastewater Treatment Facility	York	0.67	ME0101222	Mar 2030	12
7	Old Town Wastewater Treatment Facility	Old Town	0.63	ME0100471	Sep 2029	2
8	Ogunquit Wastewater Treatment Facility	Ogunquit	0.54	ME0100986	Nov 2023	8
9	Yarmouth Wastewater Treatiment Facility	Yarmouth	0.44	ME0100765	Aug 2022	3
10	Belfast Wastewater Treatment Facility	Belfast	0.42	ME0101532	Feb 2021	0
11	Lisbon Wastewater Treatment Facility	Lisbon	0.37	ME0100307	Oct 2029	4
12	Calais Wastewater Treatment Facility	Calais	0.34	ME0100129	Nov 2021	11
13	Camden Wastewater Treatment Facility	Camden	0.32	ME0100137	Dec 2023	6
14	Skowhegan Wastewater Treatment Facility	Skowhegan	0.31	ME0100625	Apr 2031	90
15	Kennebunkport Wastewater Treatment Facility	Kennebunkport	0.26	ME0101184	Nov 2026	27
16	Freeport Wastewater Treatment Facility	Freeport	0.23	ME0101036	Feb 2021	4
17	South Berwick Sd WWTF	South Berwick	0.2	ME0100820	Jun 2030	2
18	Ft Fairfield Wastewater Treatment Facility	Fort Fairfield	0.16	ME0100226	May 2022	11
19	Fort Kent WWTF	Fort Kent	0.15	ME0102369	Dec 2021	2
20	Wiscasset WWTF	Wiscasset	0.13	ME0100757	Aug 2025	10
21	Machias Wastewater Treatment Facility	Machias	0.13	ME0100323	Mar 2021	2
22	Northeast Harbor Wastewater Treatment Facility	Northeast Harbor	0.12	ME0101346	May 2025	8
23	Limerick WWTF	Limerick	0.11	ME0100871	Oct 2020	64
24	Richmond Wastewater Treatment Facility	Richmond	0.09	ME0100587	May 2030	8
25	Milo Wastewater Treatment Facility	Milo	0.08	ME0100439	Mar 2028	10

Contacts and project signals for every plant on this list

Klarifi adds verified decision-maker contacts, permit limits, discharge monitoring data and the capital projects planned in each city, filterable by technology, size and compliance record.

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Other technologies in Maine

Lagoon systems (30)Activated sludge and clarifiers (42)Oxidation ditches (6)Anaerobic digesters and biogas (23)UV disinfection (7)

Chlorine disinfection in other states

Missouri (96)West Virginia (36)Florida (30)Vermont (27)Massachusetts (25)Kentucky (18)Texas (14)Arizona (12)Georgia (11)Alaska (6)Mississippi (5)

Chlorine disinfection in Maine: questions

Sources and methodology

Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.

Data refreshed September 11, 2026.

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