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Zircoa Inc

Nonclay Refractories, Solon, Ohio. NPDES permit OH0000591, in force until Jun 30, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (12 values), outfall 002 form A monthly (2 values), outfall 003 form A monthly (6 values), outfall 004 form A monthly (2 values), outfall 601 form A monthly (6 values), outfall 801 form A monthly (2 values), and 1 more form
Renewal application due
Jan 1, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 7 of 84 reports late

Limits in force (32)

ParameterStatisticLimitMonthsOutfall
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Fluoride, total [as F]monthly average≤ 2.8 mg/Lall year001
Fluoride, total [as F]monthly average≤ 2.01 kg/dall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
pH, maximumdaily maximum≤ 9 SUall year001
pH, minimumdaily minimum≥ 6.5 SUall year001
Solids, total dissolved- 180 deg. Cmonthly average≤ 1500 mg/Lall year001
Solids, total dissolved- 180 deg. Cdaily maximum≤ 3000 mg/Lall year001
Solids, total dissolved- 180 deg. Cmonthly average≤ 1079 kg/dall year001
Solids, total dissolved- 180 deg. Cdaily maximum≤ 2157 kg/dall year001
Flow ratemonthly averagereport only (gal/d)all year002
Flow ratedaily maximumreport only (gal/d)all year002
Temperature, water deg. centigrademonthly averagereport only (deg C)all year003
Temperature, water deg. centigradedaily maximumreport only (deg C)all year003
pHdaily minimum≥ 6.5 SUall year003
pHdaily maximum≤ 9 SUall year003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
Flow ratemonthly averagereport only (gal/d)all year004
Flow ratedaily maximumreport only (gal/d)all year004
Solids, total suspendedmonthly average≤ 30 mg/Lall year601
Solids, total suspendeddaily maximum≤ 45 mg/Lall year601
Solids, total suspendedmonthly average≤ 12.4 kg/dall year601
Solids, total suspendeddaily maximum≤ 18.6 kg/dall year601
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year601
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year601
Fluoride, total [as F]monthly averagereport only (mg/L)all year801
Fluoride, total [as F]daily maximumreport only (mg/L)all year801
Fluoride, total [as F]monthly averagereport only (mg/L)all year901
Fluoride, total [as F]daily maximumreport only (mg/L)all year901

How strict are these limits?

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

Same industry: the 36 Stone, Clay, Glass and Concrete Products permits in Ohio.

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/OH0000591 · MCP: https://passage-data.com/mcp