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Tilcon Connecticut Inc.

Crushed And Broken Stone, Newington, Connecticut. NPDES permit CT0030155 expired May 31, 2016; its limits still apply. Last 12 months: no values over a limit, 2 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 31 days after each period: form 1 monthly (16 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (18)

ParameterStatisticLimitMonths
Flow ratemonthly averagereport only (gal/d)all year
Oxygen demand, chem. [low level] [COD]instantaneous maximumreport only (mg/L)all year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedinstantaneous maximumreport only (mg/L)all year
Nitrogen, nitrate total [as N]instantaneous maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]instantaneous maximumreport only (mg/L)all year
Phosphorus, total [as P]instantaneous maximumreport only (mg/L)all year
Copper, total [as Cu]instantaneous maximumreport only (mg/L)all year
Lead, total [as Pb]instantaneous maximum≤ .00914 mg/Lall year
Zinc, total [as Zn]instantaneous maximumreport only (mg/L)all year
Oil petroleum, total recoverableinstantaneous maximumreport only (mg/L)all year
Flow, maximum during 24 hr perioddaily maximum≤ 378000 gal/dall year
Flowdaily maximum≤ 378000 gal/dall year
NOAEL Static 48Hr Acute D. pulexinstantaneous minimum≥ 90 %Jun, Oct
NOAEL Static 48Hr Acute D. pulexinstantaneous minimumreport only (%)Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Nov, Dec
NOAEL Static 48Hr Acute Pimephales promelasinstantaneous minimum≥ 90 %Jun, Oct
NOAEL Static 48Hr Acute Pimephales promelasinstantaneous minimumreport only (%)Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Dec

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

Same industry: the 5 Mining and Quarrying of Nonmetallic Minerals permits in Connecticut.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/CT0030155 · MCP: https://passage-data.com/mcp