CORNERSTONE ONE LLC
555 WEST KILBOURN AVE., MILWAUKEE, WI 53203 · NAICS 238220 Plumbing, Heating, and Air-Conditioning Contractors
Having inspection records is common for businesses in regulated industries. Data and methodology
Inspection records
May 12, 2026#348932112May 12, 2026Programmed Other (K) · Complete scope, Safety#348932112$00 viol.0 violations$0 in penalties
Inspection #348932112
Dates
- Opened
- May 12, 2026
- Closing Conference Date
- May 12, 2026
- Closed
- Aug 7, 2026
Inspection
- Advance Notice
- No
- Owner Type
- Private
- Union Status
- No
- Number of Employees
- 170
Violations and Penalties
- Total Violations
- 0
- Initial Penalties
- $0
- Penalties on Record
- $0
- Site Address
- 2708 West Wisconsin Avenue, Milwaukee, WI 53208
- Industry
- 238220 Plumbing, Heating, and Air-Conditioning Contractors
Programmed Other Inspection: This inspection record is categorized as a programmed other inspection in the DOL OSHA enforcement data. The public DOL category label is preserved here without adding extra interpretation beyond the government label.
Feb 27, 2025#348073479Feb 27, 2025Planned (H) · Partial scope, Safety#348073479$00 viol.0 violations$0 in penalties
Inspection #348073479
Dates
- Opened
- Feb 27, 2025
- Closing Conference Date
- Feb 27, 2025
- Closed
- Jul 18, 2025
Inspection
- Advance Notice
- No
- Owner Type
- Private
- Union Status
- Yes
- Number of Employees
- 3
Violations and Penalties
- Total Violations
- 0
- Initial Penalties
- $0
- Penalties on Record
- $0
- Site Address
- 509 W Wisconsin Ave, Milwaukee, WI 53203
- Industry
- 238220 Plumbing, Heating, and Air-Conditioning Contractors
Planned Inspection: This inspection record is categorized as a planned inspection in the DOL OSHA enforcement data. Planned inspections are part of OSHA's scheduled enforcement activity rather than being opened directly from a complaint or reported incident at that worksite.
Jan 3, 2025#347959058Jan 3, 2025Planned (H) · Partial scope, Safety#347959058$00 viol.0 violations$0 in penalties
Inspection #347959058
Dates
- Opened
- Jan 3, 2025
- Closing Conference Date
- Jan 3, 2025
- Closed
- Jan 28, 2025
Inspection
- Advance Notice
- No
- Owner Type
- Private
- Union Status
- No
- Number of Employees
- 2
Violations and Penalties
- Total Violations
- 0
- Initial Penalties
- $0
- Penalties on Record
- $0
- Site Address
- 108 E Wells St, Milwaukee, WI 53202
- Industry
- 238220 Plumbing, Heating, and Air-Conditioning Contractors
Planned Inspection: This inspection record is categorized as a planned inspection in the DOL OSHA enforcement data. Planned inspections are part of OSHA's scheduled enforcement activity rather than being opened directly from a complaint or reported incident at that worksite.
Jan 11, 2024#347208472Jan 11, 2024Monitoring (D) · Complete scope, Safety#347208472$00 viol.0 violations$0 in penalties
Inspection #347208472
Dates
- Opened
- Jan 11, 2024
- Closing Conference Date
- Jan 11, 2024
- Closed
- Feb 8, 2024
Inspection
- Advance Notice
- No
- Owner Type
- Private
- Union Status
- No
- Number of Employees
- 25
Violations and Penalties
- Total Violations
- 0
- Initial Penalties
- $0
- Penalties on Record
- $0
- Site Address
- 405 West Kilbourn Avenue, Milwaukee, WI 53203
- Industry
- 238220 Plumbing, Heating, and Air-Conditioning Contractors
Monitoring Inspection: This inspection record is categorized as a monitoring inspection in the DOL OSHA enforcement data. The public DOL category label is preserved here without adding extra interpretation beyond the government label.
Aug 5, 2022#346127418Aug 5, 2022Monitoring (D) · Complete scope, Safety#346127418$00 viol.0 violations$0 in penalties
Inspection #346127418
Dates
- Opened
- Aug 5, 2022
- Closing Conference Date
- Aug 5, 2022
- Closed
- Sep 16, 2022
Inspection
- Advance Notice
- No
- Owner Type
- Private
- Union Status
- No
- Number of Employees
- 50
Violations and Penalties
- Total Violations
- 0
- Initial Penalties
- $0
- Penalties on Record
- $0
- Site Address
- 555 West Kilbourn Ave., Milwaukee, WI 53203
- Industry
- 238220 Plumbing, Heating, and Air-Conditioning Contractors
Monitoring Inspection: This inspection record is categorized as a monitoring inspection in the DOL OSHA enforcement data. The public DOL category label is preserved here without adding extra interpretation beyond the government label.
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.
5 inspections, 2022 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.
Short cases: When a case closed soon after it opened, the closed marker is drawn slightly to the right so both markers stay visible. Each row's card shows the exact dates.
Industry comparison
Specialty Trade Contractors, 558,619 employers with OSHA inspections. Arithmetic from DOL records.
BLS 2024 survey: plumbing, heating, and air-conditioning contractors reported 3.0 injuries and illnesses per 100 full-time workers (total recordable cases, national, private industry; relative standard error 5.2%; NAICS 23822 level). This is an industry-wide average from a federal survey, not a measurement of this establishment. Source