Mastermold LLC

What they make

Where it is

Other plants nearby

Facility	City	Industry	Status	Distance
UCUS Chemical	Watertown	Soap and Cleaning Compound Manufacturing 325610	◐ LIKELY ACTIVE	12.5 KM
Hexpol Compounding PC INC Dba Hexpol Whitewater	Whitewater	Custom Compounding of Purchased Resins 325991	◐ LIKELY ACTIVE	26.4 KM
EREpic Resins	Palmyra	Petrochemical Manufacturing 325110	◐ LIKELY ACTIVE	25.7 KM
TPTomah Products, Incorporated	Milton	Surface Active Agent Manufacturing 325613	◐ LIKELY ACTIVE	36.6 KM
CCColumbus Chemical Industries, INC.	Columbus	All Other Miscellaneous Chemical Product and Preparation Manufacturing 325998	◐ LIKELY ACTIVE	35.9 KM

Every listed plant in Jefferson County

Also at this address

No other federal record shares this street address.

Where this record comes from

5 sources hold this plant, and 10 fields on this page come from them. Each line is one agency’s own record of it: the identifier it is filed under, whether that record shows the plant operating or only that it exists, and when the register first and last saw it there.

EPA cross-references this facility in AIR, AIRS/AFS, CEDRI, EIS, NPDES, OSHA-OIS, RCRAINFO, TRIS, WI-ESR · EPA site type STATIONARY.

• EPA ECHO compliance recordsOPERATING
  first seen OCT 2025 · last seen OCT 2025
• DOL Form 5500 retirement plan filingsOPERATING
  Record 391863073|WI|53038|po box 468 · first seen JUN 2025 · last seen JUN 2025
• EPA Toxics Release InventoryOPERATING
  first seen DEC 2023 · last seen DEC 2024
• EPA Facility Registry ServiceEXISTENCE
  Record 110000416327 · first seen JUN 2017 · last seen OCT 2024
• SBA Paycheck Protection Program loan recordsEXISTENCE
  Record WI|johnson creek|111 grell ln · first seen APR 2020 · last seen FEB 2021

What each source says

Every field below, as each source filed it. The value this page shows is marked; where the sources disagree, the field says so. Status is computed from independent sources; nothing here is self-reported unless marked Claimed.

Name

EPA: MASTERMOLD LLC · OCT 2026

Street address

EPA: 111 GRELL LN · OCT 2026

City

EPA: JOHNSON CREEK · OCT 2026

State

EPA: WI · OCT 2026

County (FIPS code)

EPA: 55055 · OCT 2026

Coordinates

EPA: 43.07619,-88.76893 · OCT 2026

Employees (band)

DOL: 100-499 · JUN 2025

Retirement plan filing (Form 5500)

DOL: 353 active participants, plan year ending 2025-06-30, 2 plan(s) · JUN 2025

PPP loan

SBA PPP: PPP loan x1, approved 2021-02-25, 255 jobs reported · FEB 2021

Hazardous waste generator (RCRA)

EPA ECHO: LQG · OCT 2026