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City and County of Honolulu, Board of Water Supply

Industrial or other facility, Unknown, Hawaii. NPDES permit HI0021950, in force until Apr 30, 2031. No reports in EPA's file for the last 12 months. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001A form DY monthly (16 values), outfall 001B form DY monthly (26 values)
Last report on file
None in EPA's file for the last 12 months; that may be EPA's gap, not the facility's

Limits in force (54)

ParameterStatisticLimitMonthsOutfall
Turbidityannual average≤ 5 NTUJan, Feb, Mar, Apr, Nov, Dec001A
Turbidityannual average≤ 2 NTUMay–Oct001A
Turbiditymaximum single sample≤ 5 NTUJan, Feb, Mar, Apr, Nov, Dec001A
Turbiditymaximum single sample≤ 2 NTUMay–Oct001A
pHminimum≥ 5.5 SUall year001A
pHmaximum≤ 8 SUall year001A
Solids, total suspendedannual average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec001A
Solids, total suspendedannual average≤ 10 mg/LMay–Oct001A
Solids, total suspendedmaximum single sample≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec001A
Solids, total suspendedmaximum single sample≤ 10 mg/LMay–Oct001A
Solids, total suspendedannual average≤ 240.2 lb/dJan, Feb, Mar, Apr, Nov, Dec001A
Solids, total suspendedannual average≤ 120.1 lb/dMay–Oct001A
Solids, total suspendedmaximum single sample≤ 240.2 lb/dJan, Feb, Mar, Apr, Nov, Dec001A
Solids, total suspendedmaximum single sample≤ 120.1 lb/dMay–Oct001A
Nitrogen, total [as N]annual averagereport only (lb/d)all year001A
Nitrogen, total [as N]maximum single samplereport only (lb/d)all year001A
Phosphorus, total [as P]annual averagereport only (lb/d)all year001A
Phosphorus, total [as P]maximum single samplereport only (lb/d)all year001A
Copper, total recoverableannual averagereport only (ug/L)all year001A
Copper, total recoverablemaximum single samplereport only (ug/L)all year001A
Flow, totalannual averagereport only (gal)all year001A
Flow, totalmaximum single samplereport only (gal)all year001A
Turbidityannual average≤ 5 NTUJan, Feb, Mar, Apr, Nov, Dec001B
Turbidityannual average≤ 2 NTUMay–Oct001B
Turbiditymaximum single sample≤ 5 NTUJan, Feb, Mar, Apr, Nov, Dec001B
Turbiditymaximum single sample≤ 2 NTUMay–Oct001B
pHminimum≥ 5.5 SUall year001B
pHmaximum≤ 8 SUall year001B
Solids, total suspendedannual average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec001B
Solids, total suspendedannual average≤ 10 mg/LMay–Oct001B
Solids, total suspendedmaximum single samplereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001B
Solids, total suspendedmaximum single sample≤ 10 mg/LMay–Oct001B
Solids, total suspendedannual average≤ 14 lb/dJan, Feb, Mar, Apr, Nov, Dec001B
Solids, total suspendedannual average≤ 7 lb/dMay–Oct001B
Solids, total suspendedmaximum single sample≤ 14 lb/dJan, Feb, Mar, Apr, Nov, Dec001B
Solids, total suspendedmaximum single sample≤ 7 lb/dMay–Oct001B
Nitrogen, total [as N]annual averagereport only (lb/d)all year001B
Nitrogen, total [as N]maximum single samplereport only (lb/d)all year001B
Phosphorus, total [as P]annual averagereport only (lb/d)all year001B
Phosphorus, total [as P]maximum single samplereport only (lb/d)all year001B
Copper, total recoverableannual averagereport only (ug/L)all year001B
Copper, total recoverablemaximum single samplereport only (ug/L)all year001B
1,2-Dichloropropaneannual averagereport only (ug/L)all year001B
1,2-Dichloropropanemaximum single samplereport only (ug/L)all year001B
Trichloroethyleneannual average≤ 7 ug/Lall year001B
Trichloroethylenemaximum single sample≤ 15000 ug/Lall year001B
Chlorine, total residualannual averagereport only (ug/L)all year001B
Chlorine, total residualmaximum single sample≤ 19 ug/Lall year001B
Flow, totalannual averagereport only (gal)all year001B
Flow, totalmaximum single samplereport only (gal)all year001B
Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubiaannual averagereport only (pass=0;fail=1)all year001B
Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubiamaximum single samplereport only (pass=0;fail=1)all year001B
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasannual averagereport only (pass=0;fail=1)all year001B
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasmaximum single samplereport only (pass=0;fail=1)all year001B

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/HI0021950 · MCP: https://passage-data.com/mcp