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Gibraltar Rock @ Belle Mead

Cut Stone And Stone Products, Hillsborough Twp, New Jersey. NPDES permit NJ0003255 expired Sep 30, 2026; its limits still apply. Last 12 months: no values over a limit, 6 required values missing, 1 of 3 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 26 days after each period: form A quarterly (23 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 8 required values missing, 1 of 4 reports late

Limits in force (24)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Turbiditymonthly averagereport only (NTU)all year
Turbiditydaily maximumreport only (NTU)all year
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)all year
Oxygen, dissolved [DO]1-day averagereport only (mg/L)all year
Oxygen demand, chem. [high level] [COD]monthly average≤ 100 mg/Lall year
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year
pHmonthly minimum≥ 6 SUall year
pHmonthly maximum≤ 9 SUall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Hydrocarbons, in H2O, IR, CC14 extractible chromatographmonthly average≤ 10 mg/Lall year
Hydrocarbons, in H2O, IR, CC14 extractible chromatographdaily maximum≤ 15 mg/Lall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Acrylamidemonthly averagereport only (ug/L)all year
Acrylamidedaily maximumreport only (ug/L)all year
Solids, total dissolvedmonthly average≤ 500 mg/Lall year
Solids, total dissolveddaily maximumreport only (mg/L)all year
Duration of dischargequarterly totalreport only (d)all year
Flow, totalquarterly totalreport only (Mgal/mo)all year
Flow, totalquarterly totalreport only (Mgal/mo)all year
NOAEL Statis Renewal 48Hr Acute Ceriodaphnia dubiaminimumreport only (%)all year

How strict are these limits?

Cited limits by parameter: New Jersey's rules and the federal ones.

Same industry: the 12 Stone, Clay, Glass and Concrete Products permits in New Jersey.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/NJ0003255 · MCP: https://passage-data.com/mcp