Plumbing contractors · California

Mark Harris Plumbing Co, Inc.

El Cajon, CA · ~41 workers · 2 years of OSHA Injury Tracking Application data.

B
Good Safety Record
1.5
Avg TCR
2.8
Industry avg
0
Fatalities
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The verdict

Mark Harris Plumbing Co, Inc. runs at 53% of its industry's injury rate - safer than the typical Plumbing contractors workplace, earning a grade B.

Mark Harris Plumbing Co, Inc.: 1.5 TCR = 53% of Plumbing contractors BLS 2.8 · 2y Form 300A (see methodology below)

Mark Harris Plumbing Co, Inc. safety composite

Mark Harris Plumbing Co, Inc. scores strongest on total case rate (tcr) (safer than 78% of same-industry peers) and weakest on dart rate (safer than 29%), blended into one 0-100 breakdown against same-industry peers. A missing measure drops out and redistributes its weight rather than deflating the score. This is a per-dimension breakdown, distinct from the single letter grade above it (which weights TCR alone against the BLS industry benchmark).

D

54/100

Percentile-weighted across 3 of 3 measures

Total Case Rate (TCR)
B 1.49 per 100 workers

Safer than 78% of industry peers

DART rate
F 2.98 per 100 workers

Safer than 29% of industry peers

Fatalities
D 0

Safer than 51% of industry peers

Benchmarked live against every credibly-rated employer in the same NAICS industry code in the current OSHA extract (a segment must have at least 8 rated peers to benchmark). Not a legal or compliance determination; PlainSafetyScore's own weighting (TCR 40%, DART 35%, fatalities 25%).

Rising injury rate

Mark Harris Plumbing Co, Inc.: 0.0 → 3.0 TCR

Peak year 2024 @ 3.0 TCR · DART/TCR 2× in 2024

Mark Harris Plumbing Co, Inc.'s TCR rose 3.0 from 0.0 in 2021 to 3.0 in 2024. In 2024, DART was 2× this establishment's average TCR (severity share of cases).

OSHA ITA Form 300A scorecard

Establishment book 238220 · El Cajon, CA AT/BELOW-IND · SMALL

Grade B · TCR 1.5 · 53% of ind

  • DART 3.0 DART
  • RANK #110/594
  • PHOTO Collins Plumbing Inc.
  • BOOK 2y book
  • INJ 1 inj
  • SIZE ~41 FTE

Nearest TCR peer: Collins Plumbing Inc. (0.0 TCR gap)

Read with this employer → · Industry book → · California employers → · Look up another →

Mark Harris Plumbing Co, Inc. in the TCR neighbourhood

Average Total Case Rate among this establishment and nearest same-industry peers

TCR

What this shows Mark Harris Plumbing Co, Inc. averages 1.5 TCR (53% of the Plumbing contractors BLS benchmark).

Source U.S. Department of Labor, OSHA Injury Tracking Application (Form 300A) As of 2026-09-26

Mark Harris Plumbing Co, Inc. TCR series: 2021=0 · 2024=3 · BLS 2.8

Where Mark Harris Plumbing Co, Inc. falls in its industry

5,793 Plumbing contractors establishments

Safer than 78% of graded establishments in this industry, whose median TCR is 3.3.

More dangerous than peersSafer than peers

Narrower to California alone (the establishments it most directly competes with for workers and contracts): ranked #110 safest of 594 Plumbing contractors employers in California.

Mark Harris Plumbing Co, Inc. (41 employees, TCR 1.5) among 29 same-industry peers, split at the industry median of 60 employees and a TCR of 3.3 2×2 strategic matrix plotting 30 entities by Average employees (X) and Total Case Rate (Y), with a crosshair dividing the plot into four quadrants. Larger & higher-riskSmaller & higher-riskLarger & saferSmaller & safer than peers 050100150200250 05101520 Average employees Total Case Rate Mark Harris Plumbing Co, Inc.
Mark Harris Plumbing Co, Inc. (41 employees, TCR 1.5) among 29 same-industry peers, split at the industry median of 60 employees and a TCR of 3.3

Mark Harris Plumbing Co, Inc. has fewer employees than the Plumbing contractors median and a lower injury rate than the industry's median TCR of 3.3. Workforce size and injury rate do not always move together within the same industry -- some of its smaller peers run higher rates than its larger ones, and vice versa.

Year-by-Year Safety Data

Year TCR DART Injuries Illnesses Fatalities
2024 3.0 3.0 1 0 0
2021 0.0 0.0 0 0 0

OSHA ITA peer cross-reference

Establishment peer ledger

238220 · CA · El Cajon

5,793 Plumbing contractors employers nationwide with a credible TCR · 51,834 rated employers in California with headcount on file · 236 employers in El Cajon, CA · 4 cross-state NAT-TCR peers · 4 cross-state NAT-SIZE peers. Closest matches by relationship code are listed below.

Rel Establishment Metric
NAICS-TCR Collins Plumbing Inc. 1.5 TCR
NAICS-TCR Folsom St. AES 1.5 TCR
NAICS-TCR DK Construction 1.5 TCR
NAICS-TCR United Mechanical 1.5 TCR
STATE-SIZE CA - Antelope, 8636 Antelope North Rd Ste B 41 FTE
STATE-SIZE Hyatt Place Sacramento/Roseville 41 FTE
STATE-SIZE Camarillo Premium Outlets 41 FTE
STATE-SIZE WasteXperts Martinez 41 FTE
CITY-NEAR SOUTHERN REGION : SDU 1,176 FTE
CITY-NEAR California Department of Transportation Facility 370 1,148 FTE
CITY-NEAR GKN Aerospace Chem-tronics 1,059 FTE
CITY-NEAR GKN Aerospace Chem Tronics 938 FTE
NAT-TCR John J Brennan Construction Co., Inc 1.5 TCR
NAT-TCR Minnesota State University Moorhead 1.5 TCR
NAT-TCR Advanced Workzone Services 1.5 TCR
NAT-TCR City of Dallas Center 1.5 TCR
NAT-SIZE Refrigeration Sales Inc 41 FTE
NAT-SIZE Fleenor Paper Company - Houston 41 FTE
NAT-SIZE Dave Tomasch, Inc. 41 FTE
NAT-SIZE Herrema Dairy LLC 41 FTE

Rel codes: NAICS-TCR · STATE-SIZE · CITY-NEAR · NAT-TCR/NAT-SIZE cross-state. Read with this employer →

Data Source: OSHA Injury Tracking Application (ITA), mandatory establishment-level injury/illness reports. Grades compare employer Total Case Rate (TCR) to BLS IIF industry benchmarks. Data covers years reported by this establishment: 2024, 2021. This is publicly available government data - not a legal determination of workplace conditions.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from official public datasets. See our methodology for details.