Safety Incidents OSHA Severe Injury Reports · 2015–2025
5,189,992Inspections Most recent open 2026-07-18 Last loaded 2026-07-22

OSHA Inspection: MKS INSTRUMENTS

Referral inspection · Safety discipline

On , OSHA opened a referral safety inspection of MKS INSTRUMENTS in 90 INDUSTRIAL WAY, WILMINGTON, MA 01887 (NAICS 334519). OSHA activity number 312331317.

What this inspection record means

OSHA opens inspections for many reasons — routine scheduling under a national or local emphasis program, an employee complaint or referral, or a follow-up after a reported injury. Opening or conducting an inspection is not itself an allegation or a finding that this employer broke any rule; any findings appear as the citations listed below, and citations can be contested, reduced, or withdrawn.

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Establishment
MKS INSTRUMENTS
Site address
90 INDUSTRIAL WAY
City
WILMINGTON
State
MA
ZIP
01887
Inspection type
Referral (C)
Scope
Partial (B)
Discipline
Safety
Advance notice
No
Union status
N
Opened
Closing conference
Case closed
Last modified
Data loaded
NAICS code
334519
SIC code (legacy)
3829
Employees
170
Ownership type
A

8 citations on file for this inspection.

1910.147 C06 I

Serious Gravity 02 1 instance 125 exposed
Issued
Jan 21, 2009
Abate by
Mar 10, 2009
Penalty
Initial $1,500 · Current $750 Reduced
Recent events (2)
  • — I (S) $750.00
  • — Z (S) $1500.00

1910.147 C07 I

Serious Gravity 03 1 instance 125 exposed
Issued
Jan 21, 2009
Abate by
Mar 10, 2009
Penalty
Initial $1,875 · Current $940 Reduced
Recent events (2)
  • — I (S) $940.00
  • — Z (S) $1875.00

1910.332 B01

Serious Gravity 10 1 instance 3 exposed
Issued
Jan 21, 2009
Abate by
Feb 24, 2009
Penalty
Initial $4,500 · Current $2,250 Reduced
Recent events (2)
  • — I (S) $2250.00
  • — Z (S) $4500.00

1910.333 A02

Serious Gravity 10 1 instance 2 exposed
Issued
Jan 21, 2009
Abate by
Feb 9, 2009
Recent events (2)
  • — I (S)
  • — Z (S)

1910.334 C03

Serious Gravity 10 1 instance 3 exposed
Issued
Jan 21, 2009
Abate by
Jan 27, 2009
Recent events (2)
  • — I (S)
  • — Z (S)

1910.335 A01 I

Serious Gravity 10 1 instance 3 exposed
Issued
Jan 21, 2009
Abate by
Feb 9, 2009
Penalty
Initial $4,500 · Current $2,250 Reduced
Recent events (2)
  • — I (S) $2250.00
  • — Z (S) $4500.00

1910.335 A01 V

Serious Gravity 03 1 instance 3 exposed
Issued
Jan 21, 2009
Abate by
Feb 9, 2009

1910.335 A02 II

Serious Gravity 03 1 instance 3 exposed
Issued
Jan 21, 2009
Abate by
Feb 9, 2009
Recent events (2)
  • — I (S)
  • — Z (S)

View MKS Instruments's full OSHA safety record →

This record is reproduced from the U.S. Department of Labor Open Data API (OSHA inspection dataset). The original IMIS detail view is available at OSHA's Establishment Search for activity number 312331317.

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