Klarifi Logo
Try for freeLog in
Klarifi Logo

Lagoon systems: wastewater treatment plants in Vermont

31 plants · 48% of the state · 6 MGD reported by 24 plants

Klarifi identifies 31 publicly owned wastewater treatment plants with lagoon systems in Vermont, 48% of the 64 plants in the state (6 MGD reported by 24 plants). The largest is St Albans City in St Albans at 1.77 MGD.

Lagoon systems treat wastewater in large earthen ponds over weeks of retention time, with or without mechanical aeration. They serve thousands of small towns because they are cheap to run, but they struggle with ammonia and nutrient limits, fill with sludge over decades and are the plants most often converted or upgraded when a permit is renewed.

Lagoon systems plants nationwide →All plants in Vermont →Largest plants in Vermont →

The largest lagoons in Vermont

The 25 largest plants with lagoon systems in Vermont by average flow, with permit expiry and three-year violation count.
#FacilityCityAvg flow (MGD)NPDES permitExpiresViolations (3y)
1St Albans CitySt Albans1.77VT0100323Sep 202218
2Essex Junction Wastewater Treatment FacilityEssex Junction1.67VT0100111Jun 20262
3Waterbury WWTPWaterbury0.39VT0100463Dec 20251
4Brandon WWTFBrandon0.22VT0100056Mar 202712
5Swanton Village Wastewater Treatment FacilitySwanton0.22VT0100501Jun 202313
6Manchester Town Water & Sewer DeptManchester0.18VT0100170Sep 20230
7RandolphRandolph0.17VT0100285Sep 2020240
8Wastewater Treatment Facility No 1Shelburne0.17VT0100331Sep 202225
9Hinesburg Wastewater Treatment FacilityHinesburg0.11VT0101028Sep 202871
10Ludlow Wastewater Treatment FacilityLudlow0.1VT0100145Dec 201924
11Proctor Wastewater Treatment FacilityProctor0.08VT0100528Dec 202725
12Williamstown WPCFWilliamstown0.07VT0100722Dec 20222
13Troy/jay WWTFJay0.06VT0101168Jun 20239
14Wilmington WWTPWilmington0.05VT0100706Sep 20235
15Barton Wastewater Treatment FacilityBarton0.04VT0100641Mar 202416
16Fairfax Wastewater Treatment FacilityFairfax0.04VT0101087Jun 2023133
17Orleans Wastewater Treatment FacilityOrleans0.04VT0100251Mar 202493
18Royalton WWTFSouth Royalton0.03VT0100854Jun 20240
19Richford Wastewater Treatment FacilityRichford0.03VT0100790Jun 202383
20Jeffersonville W W T FVergennes0.02VT0101150Jun 202330
21Vt Correctional IndSt Albans0.02VT0101117Sep 20222
22Marshfield Wastewater Treatment FacilityMarshfield0.02VT0100471Dec 20257
23Readsboro WPCReadsboro0.01VT0100731Mar 20282
24Orwell W P C FOrwell0.0034VT0100676Jun 20242
25Bradford WPCPBradford—VT0100803Dec 20200

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.

Start a free trialKlarifi Plus: done-for-you outreach for this segment →

Other technologies in Vermont

Activated sludge and clarifiers (19)Anaerobic digesters and biogas (24)UV disinfection (21)Chlorine disinfection (27)Nutrient removal (14)

Lagoon systems in other states

Iowa (632)Illinois (481)Texas (373)Minnesota (341)Missouri (290)Kansas (288)Ohio (260)Arkansas (238)Oklahoma (197)North Dakota (195)Indiana (189)Michigan (182)

Lagoon systems in Vermont: 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.

Try Klarifi for free

Create your own trial account and explore how Klarifi can help you.

Try for free