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Isle of Palms Water & Sewer Commission

Sewage treatment plant, Isle Of Palms, South Carolina. NPDES permit SC0043583, in force until Feb 28, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 29 days after each period: form 1 monthly (8 values)
Last report on file: August 2026
Oct 2024 – Sep 2025: 2 values over a limit, 0 required values missing, 0 of 13 reports late

Limits in force (8)

Parameter	Statistic	Limit	Months
pH	minimum	≥ 6.5 SU	all year
pH	maximum	≤ 8.5 SU	all year
Solids, total suspended	monthly average	≤ 20 mg/L	all year
Solids, total suspended	daily maximum	≤ 40 mg/L	all year
Copper, total [as Cu]	monthly average	report only (mg/L)	all year
Copper, total [as Cu]	daily maximum	report only (mg/L)	all year
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year

New limits from Jan 1, 2029

Parameter	New limit	New or tighter	Median, last 12 months	× new limit
Copper, total [as Cu], daily maximum	0.083 mg/L	new	0 mg/L (6 values)	0×
Copper, total [as Cu], monthly average	0.053 mg/L	new	0 mg/L (6 values)	0×

How strict are these limits?

Solids, total suspended, monthly average 20 mg/L — stricter than 96% of 60 other minor POTWs in South Carolina; 3% have the same limit
pH, minimum at least 6.5 SU — stricter than 93% of 59 other minor POTWs in South Carolina; 7% have the same limit
Solids, total suspended, daily maximum 40 mg/L — stricter than 56% of 1,356 other minor POTWs nationwide; 16% have the same limit

Cited limits by parameter: South Carolina'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/SC0043583 · MCP: https://passage-data.com/mcp