County of Maui — NPDES permit HI0021661: limits, due date and EPA's record

Water Supply, Wailuku, Hawaii. NPDES permit HI0021661 expired Jul 31, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Limits in force (26)

Parameter	Statistic	Limit	Months	Outfall
Turbidity	maximum	≤ 5 NTU	Jan, Feb, Mar, Apr, Nov, Dec	001
Turbidity	maximum	≤ 2 NTU	May–Oct	001
pH	minimum	≥ 5.5 SU	all year	001
pH	maximum	≤ 8 SU	all year	001
Solids, total suspended	maximum	≤ 20 mg/L	Jan, Feb, Mar, Apr, Nov, Dec	001
Solids, total suspended	maximum	≤ 10 mg/L	May–Oct	001
Flow, total	total	report only (gal)	all year	001
Dibromochloropropane	maximum	report only (ug/L)	all year	001
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas	maximum	≤ 0 pass=0;fail=1	all year	001
Turbidity	maximum	≤ 5 NTU	Jan, Feb, Mar, Apr, Nov, Dec	002
Turbidity	maximum	≤ 2 NTU	May–Oct	002
Turbidity	maximum	≤ 5 NTU	Jan, Feb, Mar, Apr, Nov, Dec	002
Turbidity	maximum	≤ 2 NTU	May–Oct	002
pH	minimum	≥ 5.5 SU	all year	002
pH	minimum	≥ 5.5 SU	all year	002
pH	maximum	≤ 8 SU	all year	002
pH	maximum	≤ 8 SU	all year	002
Solids, total suspended	maximum	≤ 20 mg/L	Jan, Feb, Mar, Apr, Nov, Dec	002
Solids, total suspended	maximum	≤ 20 mg/L	Jan, Feb, Mar, Apr, Nov, Dec	002
Solids, total suspended	maximum	≤ 10 mg/L	May–Oct	002
Solids, total suspended	maximum	≤ 10 mg/L	May–Oct	002
Chlorine, total residual	maximum	≤ 19 ug/L	all year	002
Flow, total	maximum	report only (gal)	all year	002
Flow, total	maximum	report only (gal)	all year	002
Dibromochloropropane	maximum	report only (ug/L)	all year	002
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas	maximum	≤ 0 pass=0;fail=1	all year	002

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/HI0021661 · MCP: https://passage-data.com/mcp