HILTON HEAD PUBLIC SERVICE DISTRICT

NPDES permit SC0046191 · Major POTW · administratively continued, expires 2025-12-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2025-12-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

6values over a limit
0required values missing, on 0 form(s)
0of 71 forms filed late

Last period with anything received: 2026-07-31. Most often over: Zinc, total [as Zn] (4), Coliform, fecal general (1), Solids, total suspended (1).

Reporting

Reports are due about 29 days after each monitoring period ends (the most common figure among SC permits in EPA's filings — check your permit).

Limits in force (61)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MINIMUM >= 5 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 5 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 7.5 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 270 lb/d all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 401 lb/d all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 8.5 SU all year
001Solids, total suspendedMO AVG <= 5 mg/L all year
001Solids, total suspendedWKLY AVG <= 7.5 mg/L all year
001Solids, total suspendedMO AVG <= 270 lb/d all year
001Solids, total suspendedWKLY AVG <= 401 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG <= 5 mg/L Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG <= 7.5 mg/L Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 270 lb/d Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG <= 401 lb/d Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
001Hardness, total [as CaCO3]MO AVG report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Zinc, total [as Zn]MO AVG <= .086 mg/L all year
001Zinc, total [as Zn]DAILY MX <= .095 mg/L all year
001Zinc, total [as Zn]MO AVG <= 4.6 lb/d all year
001Zinc, total [as Zn]DAILY MX <= 5.1 lb/d all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantWKLY AVG report only all year
001Cyanide, free availableMO AVG <= .001 mg/L all year
001Cyanide, free availableDAILY MX <= .001 mg/L all year
001Cyanide, free availableMO AVG <= .053 lb/d all year
001Cyanide, free availableDAILY MX <= .053 lb/d all year
001Enterococci30DAVGEO <= 35 MPN/100mL all year
001EnterococciDAILY MX <= 104 MPN/100mL all year
001Enterococci30DAVGEO <= 35 MPN/100mL all year
001EnterococciDAILY MX <= 800 MPN/100mL all year
001Coliform, fecal general30DAVGEO <= 14 MPN/100mL all year
001Coliform, fecal generalDAILY MX <= 43 MPN/100mL all year
001Coliform, fecal general30DAVGEO <= 14 MPN/100mL all year
001Coliform, fecal generalDAILY MX <= 200 MPN/100mL all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001LC50 Static 48Hr Acute Ceriodaphnia dubiaDAILY MN report only all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AVG <= 25 % all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX <= 40 % all year
001IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MN report only all year
002Flow, in conduit or thru treatment plantMO AVG <= .7 MGD all year
002Flow, in conduit or thru treatment plantWKLY AVG <= .7 MGD all year
002Chlorine, total residualMO AVG <= .008 mg/L all year
002Chlorine, total residualDAILY MX <= .013 mg/L all year
003Flow, in conduit or thru treatment plantMO AVG <= 1.39 MGD all year
003Flow, in conduit or thru treatment plantWKLY AVG <= 1.39 MGD all year
003Chlorine, total residualMO AVG <= .008 mg/L all year
003Chlorine, total residualDAILY MX <= .013 mg/L all year
004Flow, in conduit or thru treatment plantMO AVG <= 1.68 MGD all year
004Flow, in conduit or thru treatment plantWKLY AVG <= 1.68 MGD all year
004Chlorine, total residualMO AVG <= .008 mg/L all year
004Chlorine, total residualDAILY MX <= .013 mg/L all year
005Flow, in conduit or thru treatment plantMO AVG <= .9 MGD all year
005Flow, in conduit or thru treatment plantWKLY AVG <= .9 MGD all year
005Chlorine, total residualMO AVG <= .008 mg/L all year
005Chlorine, total residualDAILY MX <= .013 mg/L all year
006Flow, in conduit or thru treatment plantMO AVG <= 1.423 MGD all year
006Flow, in conduit or thru treatment plantDAILY MX <= 1.423 MGD all year
006Chlorine, total residualMO AVG <= .008 mg/L all year
006Chlorine, total residualDAILY MX <= .013 mg/L all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states