MKS INSTRUMENTS
90 INDUSTRIAL WAY, WILMINGTON, MA 01887 · NAICS 541710
Having inspection records is common for businesses in regulated industries. Data and methodology
Inspection records
Aug 3, 2026#349086991Aug 3, 2026Referral (C) · Partial scope, Safety#349086991$00 viol.0 violations$0 in penalties
Inspection #349086991
Dates
- Opened
- Aug 3, 2026
- Closing Conference Date
- Aug 3, 2026
- Closed
- Oct 5, 2026
Inspection
- Advance Notice
- No
- Owner Type
- Private
- Union Status
- No
- Number of Employees
- 266
- Related Activity
- 1 referral
Violations and Penalties
- Total Violations
- 0
- Initial Penalties
- $0
- Penalties on Record
- $0
- Site Address
- 90 Industrial Way, Wilmington, MA 01887
- Industry
- 334413 Semiconductor and Related Device Manufacturing
Referral Inspection: This inspection record is categorized as a referral inspection in the DOL OSHA enforcement data. Referral inspections can result from another agency, another OSHA activity, or another source referring a potential hazard to OSHA.
Jul 25, 2008#312331317Jul 25, 2008Referral (C) · Partial scope, Safety#312331317$6,1908 viol.8 violations$6,190 in penalties
Inspection #312331317
Dates
- Opened
- Jul 25, 2008
- Closing Conference Date
- Jul 25, 2008
- Closed
- Mar 6, 2009
Inspection
- Advance Notice
- No
- Owner Type
- Private
- Union Status
- No
- Number of Employees
- 170
- Related Activity
- 1 referral
Violations and Penalties
- Total Violations
- 8
- Violation Types
- 8 serious
- Initial Penalties
- $12,375
- Penalties on Record
- $6,190
- Site Address
- 90 Industrial Way, Wilmington, MA 01887
- Industry
- 334519 Other Measuring and Controlling Device Manufacturing
Referral Inspection: This inspection record is categorized as a referral inspection in the DOL OSHA enforcement data. Referral inspections can result from another agency, another OSHA activity, or another source referring a potential hazard to OSHA.
Violations
Violation list (8 of 8 shown)
| Citation | Standard | Type | Instances | Exposed | Initial | Current | Abatement | Contest | Final Order |
|---|---|---|---|---|---|---|---|---|---|
| 01001 | 1910.147 Control of Hazardous Energy (Lockout/Tagout) OSHA citation code: 19100147 C06 I | Serious | 1 | 125 | $1,500 | $750 | Mar 10, 2009 | - | - |
| 01002 | 1910.147 Control of Hazardous Energy (Lockout/Tagout) OSHA citation code: 19100147 C07 I | Serious | 1 | 125 | $1,875 | $940 | Mar 10, 2009 | - | - |
| 01003A | 1910.332 Electrical Safety-Related Work Practices - Training OSHA citation code: 19100332 B01 | Serious | 1 | 3 | $4,500 | $2,250 | Feb 24, 2009 | - | - |
| 01003B | 1910.333 Electrical - Selection and Use of Work Practices OSHA citation code: 19100333 A02 | Serious | 1 | 2 | $0 | $0 | Feb 9, 2009 | - | - |
| 01003C | 1910.334 Electrical - Use of Equipment OSHA citation code: 19100334 C03 | Serious | 1 | 3 | $0 | $0 | Jan 27, 2009 | - | - |
| 01004A | 1910.335 Electrical - Safeguards OSHA citation code: 19100335 A01 I | Serious | 1 | 3 | $4,500 | $2,250 | Feb 9, 2009 | - | - |
| 01004B | 1910.335 Electrical - Safeguards OSHA citation code: 19100335 A01 V | Serious | 1 | 3 | $0 | $0 | Feb 9, 2009 | - | - |
| 01004C | 1910.335 Electrical - Safeguards OSHA citation code: 19100335 A02 II | Serious | 1 | 3 | $0 | $0 | Feb 9, 2009 | - | - |
Jun 23, 2005#309008894Jun 23, 2005Referral (C) · Partial scope, Health#309008894$3,2502 viol.2 violations$3,250 in penalties
Inspection #309008894
Dates
- Opened
- Jun 23, 2005
- Closing Conference Date
- Jul 29, 2005
- Closed
- Oct 5, 2005
Inspection
- Advance Notice
- No
- Owner Type
- Private
- Union Status
- No
- Number of Employees
- 200
- Related Activity
- 1 referral
Violations and Penalties
- Total Violations
- 2
- Violation Types
- 2 serious
- Initial Penalties
- $3,250
- Penalties on Record
- $3,250
- Site Address
- 90 Industrial Way, Wilmington, MA 01887
- Industry
- 541710
Referral Inspection: This inspection record is categorized as a referral inspection in the DOL OSHA enforcement data. Referral inspections can result from another agency, another OSHA activity, or another source referring a potential hazard to OSHA.
Violations
Violation list (2 of 2 shown)
| Citation | Standard | Type | Instances | Exposed | Initial | Current | Abatement | Contest | Final Order |
|---|---|---|---|---|---|---|---|---|---|
| 01001 | 1910.303 Electrical - General Requirements OSHA citation code: 19100303 G02 I | Serious | 3 | 10 | $1,625 | $1,625 | Aug 29, 2005 | - | - |
| 01002 | 1910.333 Electrical - Selection and Use of Work Practices OSHA citation code: 19100333 A | Serious | 1 | 10 | $1,625 | $1,625 | Aug 29, 2005 | - | - |
Penalty amounts may differ from final amounts after settlement or judicial review. How to read these records
About these records
A company page groups inspections with the same normalized employer name, city and state; it is not a legal-entity identifier (how pages are grouped).
This page displays public OSHA enforcement data. Status text follows the DOL inspection record first and may include citation-level context when the inspection feed and citation records are out of sync. Penalty amounts shown reflect the latest penalty amounts on record in the DOL database and may differ from initial assessments or final amounts. This is not an official OSHA resource.
OSHA's public enforcement data does not publish a "guilty" or "not guilty" field for inspections. The closest outcome fields available are the citation counts, penalty amounts, contest dates, final-order dates, and the inspection close date shown on this page. How to interpret these status fields. How initial and current penalties are recorded.
OSHA may publish multiple citation rows in the same inspection with the same standard and penalty fields. Separate rows can still differ in OSHA metadata such as citation identifier, recorded instance count, exposed workers, or gravity value. Contest and Final Order columns show citation-level dates from OSHA's enforcement record. A dash means OSHA's record does not currently show that activity for the citation.
Understanding These Penalties
The maximum penalty for a serious violation in 2025 is $16,550 per violation. For willful violations, the range is $11,823 to $165,514. The current penalty column shows the latest amount on record in OSHA's database for each citation. When the current penalty differs from the initial penalty, OSHA's records show that the amount changed during the enforcement process, but this page does not determine the specific reason for each change. Penalty amounts are set by OSHA and adjusted annually for inflation.
3 inspections, 2005 to 2026. Each row is one inspection; point at or tap a row for its dates and totals.
Source: DOL OSHA enforcement data (inspections and violations), linked via activity_nr (exact government key).
Penalty changes: Amounts shown reflect what OSHA's enforcement record publishes. The reason for any change is not stated unless OSHA's record explicitly says so.
Standards cited
Industry comparison
Professional, Scientific, and Technical Services, 15,976 employers with OSHA inspections. Arithmetic from DOL records.