Passage Data · Check a report · Use it from your AI

Hawaiian Cement - Halawa Quarry

Ready-Mixed Concrete, Aiea, Hawaii. NPDES permit HI0000558 expired Apr 30, 2025; its limits still apply. Last 12 months: no values over a limit, 16 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form Q quarterly (8 values)
Last report on file
December 2025
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 4 reports late

Limits in force (12)

ParameterStatisticLimitMonths
Turbiditymaximum≤ 25 NTU (alert, not enforceable)Jan, Feb, Mar, Apr, Nov, Dec
Turbiditymaximum≤ 10 NTU (alert, not enforceable)May–Oct
pHminimum≥ 6 SUall year
pHmaximum≤ 8 SUall year
Solids, total suspendedmaximum≤ 80 mg/L (alert, not enforceable)Jan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmaximum≤ 55 mg/L (alert, not enforceable)May–Oct
Nitrogen, total [as N]maximum≤ 800 ug/L (alert, not enforceable)Jan, Feb, Mar, Apr, Nov, Dec
Nitrogen, total [as N]maximum≤ 600 ug/L (alert, not enforceable)May–Oct
Phosphorus, total [as P]maximum≤ 150 ug/L (alert, not enforceable)Jan, Feb, Mar, Apr, Nov, Dec
Phosphorus, total [as P]maximum≤ 80 ug/L (alert, not enforceable)May–Sep
Iron, total [as Fe]maximum≤ 1000 ug/L (alert, not enforceable)all year
Flow, in conduit or thru treatment plantmaximumreport only (MGD)all year

How strict are these limits?

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

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

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/HI0000558 · MCP: https://passage-data.com/mcp