Data / Mines / Connecticut / New Haven County
Mines in New Haven County, Connecticut: 15 open mines
MSHA lists 15 open mines in New Haven County, Connecticut, run by 11 operators and employing 131 people. Since January 1, 2022 its inspectors issued 236 citations and orders there with $38,434 in proposed penalties, and operators reported 24 injury or illness cases, 1 of them fatal. The operators with the most open mines are O & G Industries Inc; Tilcon Connecticut Inc.; WSS Holdings LLC. Data from MSHA, November 6, 2026.
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- Open mines
- 15
- Operators
- 11
- Employees
- 131
- Active
- 9
- Intermittent
- 5
- Temporarily Idled
- 1
- Citations and orders since January 1, 2022
- 236
- Significant and substantial
- 33 (14.0%)
- Closure orders
- 9
- High negligence or reckless
- 13
- Proposed penalties
- $38,434
- Amount paid so far
- $36,111
- Inspections
- 96
- Inspector hours on site
- 1,001
- Citations per inspection
- 2.46 (all mines 2.30)
- Accident reports
- 24
- Injury and illness cases
- 24
- Fatalities
- 1
- Latest MSHA record
- October 9, 2026
Operators with the most open mines in New Haven County, Connecticut
Ranked by open mines, then by citations. Sole proprietors and individuals are not listed.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| O & G Industries Inc | 3 | 21 | 17 | $2,054 | 4 |
| Tilcon Connecticut Inc. | 2 | 42 | 49 | $8,184 | 13 |
| WSS Holdings LLC | 2 | 13 | 25 | $3,883 | 0 |
| Stony Creek Quarry Corporation | 1 | 9 | 37 | $5,959 | 1 |
| The York Hill Trap Rock Quarry Company, Inc. | 1 | 15 | 30 | $5,519 | 4 |
| Defeo Materials LLC | 1 | 4 | 18 | $3,406 | 1 |
| Guerrera Construction Company Inc | 1 | 3 | 15 | $2,265 | 0 |
| Haynes Materials Company | 1 | 11 | 15 | $2,408 | 1 |
| Level Development Corporation | 1 | 0 | 12 | $1,897 | 0 |
| Tony Calabro Sons Inc | 1 | 8 | 12 | $1,812 | 0 |
| F&F Materials, LLC | 1 | 5 | 6 | $1,047 | 0 |
Operators with the most citations in New Haven County, Connecticut
Citations and orders issued since January 1, 2022 at their open mines here.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Tilcon Connecticut Inc. | 2 | 42 | 49 | $8,184 | 13 |
| Stony Creek Quarry Corporation | 1 | 9 | 37 | $5,959 | 1 |
| The York Hill Trap Rock Quarry Company, Inc. | 1 | 15 | 30 | $5,519 | 4 |
| WSS Holdings LLC | 2 | 13 | 25 | $3,883 | 0 |
| Defeo Materials LLC | 1 | 4 | 18 | $3,406 | 1 |
| O & G Industries Inc | 3 | 21 | 17 | $2,054 | 4 |
| Guerrera Construction Company Inc | 1 | 3 | 15 | $2,265 | 0 |
| Haynes Materials Company | 1 | 11 | 15 | $2,408 | 1 |
| Level Development Corporation | 1 | 0 | 12 | $1,897 | 0 |
| Tony Calabro Sons Inc | 1 | 8 | 12 | $1,812 | 0 |
| F&F Materials, LLC | 1 | 5 | 6 | $1,047 | 0 |
Mines with the most citations
Open mines, ranked by citations and orders since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Stony Creek | Stony Creek Quarry Corporation | New Haven County, CT | Dimension stone | 9 | 37 |
| York Hill Mine & Mill | The York Hill Trap Rock Quarry Company, Inc. | New Haven County, CT | Crushed, broken stone | 15 | 30 |
| North Branford Quarry | Tilcon Connecticut Inc. | New Haven County, CT | Crushed, broken traprock | 40 | 29 |
| Wallingford Quarry | Tilcon Connecticut Inc. | New Haven County, CT | Crushed, broken stone | 2 | 20 |
| Defeo Portable Plant | Defeo Materials LLC | New Haven County, CT | Crushed, broken stone | 4 | 18 |
| Haynes Aggregates, Seymour LLC | Haynes Materials Company | New Haven County, CT | Crushed, broken stone | 11 | 15 |
| Goliath-7 | Guerrera Construction Company Inc | New Haven County, CT | Crushed, broken stone | 3 | 15 |
| Quarry No 2 Southbury | O & G Industries Inc | New Haven County, CT | Crushed, broken limestone | 16 | 13 |
| Waterbury Quarry | WSS Holdings LLC | New Haven County, CT | Crushed, broken stone | 10 | 13 |
| Pearl Lake Road Pit & Mill | Tony Calabro Sons Inc | New Haven County, CT | Crushed, broken sandstone | 8 | 12 |
| Beacon Falls Quarry | WSS Holdings LLC | New Haven County, CT | Crushed, broken stone | 3 | 12 |
| Waterville Materials | Level Development Corporation | New Haven County, CT | Crushed, broken stone | 0 | 12 |
| Split Rock | F&F Materials, LLC | New Haven County, CT | Crushed, broken stone | 5 | 6 |
| Beacon Falls Wash Plant #2 | O & G Industries Inc | New Haven County, CT | Construction sand and gravel | 2 | 3 |
| O & G Prospect Quarry #3 | O & G Industries Inc | New Haven County, CT | Crushed, broken granite | 3 | 1 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Crushed, broken stone | 9 | 60% |
| Dimension stone | 1 | 6.7% |
| Crushed, broken traprock | 1 | 6.7% |
| Crushed, broken sandstone | 1 | 6.7% |
| Crushed, broken granite | 1 | 6.7% |
| Crushed, broken limestone | 1 | 6.7% |
| Construction sand and gravel | 1 | 6.7% |
Citations and injury cases by year
Calendar years since 2022; 2026 runs to the date of the MSHA files.
| Year | Citations and orders | Significant and substantial | Proposed penalties | Injury and illness cases |
|---|---|---|---|---|
| 2022 | 15 | 1 | $2,622 | 4 |
| 2023 | 39 | 4 | $6,129 | 3 |
| 2024 | 36 | 3 | $5,792 | 5 |
| 2025 | 77 | 9 | $11,761 | 2 |
| 2026 | 69 | 16 | $12,130 | 10 |
Standards cited most at mines in New Haven County, Connecticut
Sections of Title 30 of the Code of Federal Regulations named on the citations, with the part each belongs to.
| Standard | What the part covers | Citations |
|---|---|---|
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 17 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 13 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 12 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 11 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 8 |
| 30 CFR 47.44 | Hazard communication | 7 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 7 |
| 30 CFR 46.9 | Training at sand, gravel and surface stone mines | 7 |
| 30 CFR 56.4104 | Surface metal and nonmetal mines | 6 |
Injury and illness cases at mines in New Haven County, Connecticut
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Fatality | 1 |
| Days away from work or restricted activity | 13 |
| No lost time, or an occupational illness | 10 |
What the accident reports at mines in New Haven County, Connecticut describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 8 |
| Powered haulage | 3 |
| Machinery | 3 |
| Slip or fall of person | 3 |
| Disorders (repeated trauma) | 2 |
| Other | 1 |
| Handtools (nonpowered) | 1 |
| Striking or bumping | 1 |
| Stepping or kneeling on object | 1 |
| Fall of face/rib/pillar/side/highwall | 1 |
Equipment named in accident reports at mines in New Haven County, Connecticut
| Equipment | Reports |
|---|---|
| Front-end loader | 2 |
| Hand tools (powered) | 2 |
| Conveyor | 2 |
| Crusher | 2 |
| Locomotive | 1 |
| Carriage-mounted drills | 1 |
| Hand tools (not powered) | 1 |
| Welding machine | 1 |
Updated November 6, 2026. Read from US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets. US government work, public domain. Counts come from the MSHA files published on November 6, 2026. An open mine is one MSHA lists as Active, Intermittent, New Mine, Temporarily Idled or NonProducing; 13,673 were open that day. Citations, penalties, inspections and accident reports run from January 1, 2022. A citation is an inspector's allegation and an operator can contest it; the penalty is the amount MSHA first proposed, before any contest or settlement. An operator is the legal entity MSHA assesses, and a parent company is its controller. Mines run by sole proprietors or by individuals are counted in every total and are not named. This page uses MSHA data and is not endorsed or certified by MSHA. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.