Sewage treatment plants or facilities · California

Delta Diablo

Antioch, CA · ~68 workers · 2 years of OSHA Injury Tracking Application data.

F
Failing Safety Record
4.2
Avg TCR
1.2
Industry avg
0
Fatalities
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The verdict

Delta Diablo runs at 348% of its industry's injury rate - far more dangerous than the typical Sewage treatment plants or facilities workplace, earning a grade F.

Delta Diablo: 4.2 TCR = 348% of Sewage treatment plants or facilities BLS 1.2 · 2y Form 300A (see methodology below)

Delta Diablo safety composite

Delta Diablo scores strongest on total case rate (tcr) (safer than 52% of same-industry peers) and weakest on fatalities (safer than 50%), 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

52/100

Percentile-weighted across 3 of 3 measures

Total Case Rate (TCR)
D 4.17 per 100 workers

Safer than 52% of industry peers

DART rate
D 1.57 per 100 workers

Safer than 52% of industry peers

Fatalities
D 0

Safer than 50% 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%).

TCR Δ

−5.2

2023→2024

Delta Diablo injury rate improved

Delta Diablo's TCR fell 5.2 from 6.8 in 2023 to 1.6 in 2024. Peak filing year was 2023 at 6.8 TCR. In 2024, DART was 0.38× this establishment's average TCR (severity share of cases).

2023=6.8 · 2024=1.6

OSHA ITA Form 300A scorecard

Establishment book 221320 · Antioch, CA ABOVE-IND · SMALL

Grade F · TCR 4.2 · 348% of ind

  • DART 1.6 DART
  • RANK #25/74
  • PHOTO Warner Robins Project
  • BOOK 2y book
  • INJ 3 inj
  • SIZE ~68 FTE

Nearest TCR peer: Warner Robins Project (0.0 TCR gap)

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

Delta Diablo in the TCR neighbourhood

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

TCR

What this shows Delta Diablo averages 4.2 TCR (348% of the Sewage treatment plants or facilities BLS benchmark).

Source U.S. Department of Labor, OSHA Injury Tracking Application (Form 300A) As of 2026-08-25

Delta Diablo TCR series: 2023=6.8 · 2024=1.6 · BLS 1.2

Where Delta Diablo falls in its industry

400 Sewage treatment plants or fac establishments

Safer than 52% of graded establishments in this industry, whose median TCR is 4.4.

More dangerous than peersSafer than peers

Narrower to California alone (the establishments it most directly competes with for workers and contracts): ranked #25 safest of 74 Sewage treatment plants or fac employers in California.

Delta Diablo (68 employees, TCR 4.2) among 29 same-industry peers, split at the industry median of 47 employees and a TCR of 4.4 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 0200400600 0510152025 Average employees Total Case Rate Delta Diablo
Delta Diablo (68 employees, TCR 4.2) among 29 same-industry peers, split at the industry median of 47 employees and a TCR of 4.4

Delta Diablo has more employees than the Sewage treatment plants or facilities median and a lower injury rate than the industry's median TCR of 4.4. 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 1.6 1.6 1 0 0
2023 6.8 1.7 2 2 0

OSHA ITA peer cross-reference

Establishment peer ledger

221320 · CA · Antioch

400 Sewage treatment plants or facilities employers nationwide with a credible TCR · 51,834 rated employers in California with headcount on file · 85 employers in Antioch, 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 Warner Robins Project 4.2 TCR
NAICS-TCR Greater Owuachita Water Co. 4.2 TCR
NAICS-TCR Utilities - Wastewater Collections 4.2 TCR
NAICS-TCR Mendenhall Wastewater Treatment Plant 4.1 TCR
STATE-SIZE California Valley Land Co. 68 FTE
STATE-SIZE MCFFO 68 FTE
STATE-SIZE VinePro Vineyard Management, Inc. 68 FTE
STATE-SIZE Knights Grapevine Nursery 68 FTE
CITY-NEAR California Department of Transportation Facility 104 2,817 FTE
CITY-NEAR 2032-02121701 1,598 FTE
CITY-NEAR 02821701 ANTIOCH MEDICAL CENTER 1,210 FTE
CITY-NEAR 0206-02621701 1,130 FTE
NAT-TCR Avery Brewing Company 4.2 TCR
NAT-TCR Ohwtc - West Chester Distribution Ctr - 11469 4.2 TCR
NAT-TCR Iabur - Burlington 4.2 TCR
NAT-TCR Banyan Air Services, Inc 4.2 TCR
NAT-SIZE Ensight Solutions 68 FTE
NAT-SIZE Ronyak Paving Inc. 68 FTE
NAT-SIZE Central TX Sales Admin 68 FTE
NAT-SIZE Kemco Systems 68 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, 2023. 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.