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County of Maui

Industrial or other facility, Wailuku, Hawaii. NPDES permit HI0021848, in force until Sep 30, 2030. Last 12 months: over a limit 64 times (last August 2026), 225 required values missing, 11 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: outfall 001 form A monthly (36 values), outfall INF form A monthly (17 values), outfall 001 form Q quarterly, outfall 001 form Y yearly, outfall 001 form Z yearly
Last report on file
August 2026

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

All 64 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as NH4], daily maximum700 ug/L≤ 5 ug/L13900%
October 2025Nitrogen, ammonia total [as NH4], daily maximum700 ug/L≤ 5 ug/L13900%
October 2025Nitrogen, total [as N], daily maximum166.83 lb/d≤ 13.51 lb/d1135%
October 2025Nitrogen, total [as N], daily maximum166.83 lb/d≤ 13.51 lb/d1135%
October 2025Turbidity, daily maximum1.47 NTU≤ .5 NTU—
October 2025pH, minimum7.55 SU≥ 7.6 SU—
November 2025Nitrogen, ammonia total [as NH4], daily maximum826 ug/L≤ 5 ug/L16420%
November 2025Nitrogen, ammonia total [as NH4], daily maximum826 ug/L≤ 5 ug/L16420%
November 2025Nitrogen, total [as N], daily maximum202.06 lb/d≤ 13.51 lb/d1396%
November 2025Nitrogen, total [as N], daily maximum202.06 lb/d≤ 13.51 lb/d1396%
November 2025Turbidity, daily maximum1.99 NTU≤ .5 NTU—
November 2025pH, minimum7.47 SU≥ 7.6 SU—
December 2025Nitrogen, ammonia total [as NH4], daily maximum2330 ug/L≤ 5 ug/L46500%
December 2025Nitrogen, ammonia total [as NH4], daily maximum2330 ug/L≤ 5 ug/L46500%
December 2025Nitrogen, total [as N], daily maximum229.51 lb/d≤ 13.51 lb/d1599%
December 2025Nitrogen, total [as N], daily maximum229.51 lb/d≤ 13.51 lb/d1599%
December 2025Phosphorus, total [as P], daily maximum41.38 lb/d≤ 2.25 lb/d1739%
December 2025Phosphorus, total [as P], daily maximum41.38 lb/d≤ 2.25 lb/d1739%
December 2025Turbidity, daily maximum1.81 NTU≤ .5 NTU—
December 2025pH, minimum7.06 SU≥ 7.6 SU—
January 2026Coliform, fecal general, daily maximum920.8 CFU/100mL≤ 200 CFU/100mL360%
January 2026Coliform, fecal general, daily maximum920.8 CFU/100mL≤ 200 CFU/100mL360%
January 2026Nitrogen, ammonia total [as NH4], daily maximum610 ug/L≤ 5 ug/L12100%
January 2026Nitrogen, ammonia total [as NH4], daily maximum610 ug/L≤ 5 ug/L12100%
January 2026Nitrogen, total [as N], daily maximum331.99 lb/d≤ 13.51 lb/d2357%
January 2026Nitrogen, total [as N], daily maximum331.99 lb/d≤ 13.51 lb/d2357%
January 2026Turbidity, daily maximum1.8 NTU≤ .5 NTU—
January 2026pH, minimum7.3 SU≥ 7.6 SU—
February 2026Nitrogen, ammonia total [as NH4], daily maximum560 ug/L≤ 5 ug/L11100%
February 2026Nitrogen, total [as N], daily maximum256.77 lb/d≤ 13.51 lb/d1801%
February 2026Turbidity, daily maximum1.59 NTU≤ .5 NTU—
February 2026pH, minimum7.5 SU≥ 7.6 SU—
March 2026Coliform, fecal general, daily maximum≥ 2419.6 CFU/100mL≤ 200 CFU/100mL1110%
March 2026Flow, in conduit or thru treatment plant, daily maximum9.86 MGD≤ 9 MGD10%
March 2026Nitrogen, ammonia total [as NH4], daily maximum425 ug/L≤ 5 ug/L8400%
March 2026Nitrogen, total [as N], daily maximum336.73 lb/d≤ 13.51 lb/d2392%
March 2026Phosphorus, total [as P], daily maximum40.68 lb/d≤ 2.25 lb/d1708%
March 2026Turbidity, daily maximum1.89 NTU≤ .5 NTU—
March 2026pH, minimum7.04 SU≥ 7.6 SU—
April 2026Nitrogen, ammonia total [as NH4], daily maximum540 ug/L≤ 5 ug/L10700%
April 2026Nitrogen, total [as N], daily maximum246.65 lb/d≤ 13.51 lb/d1726%
April 2026Phosphorus, total [as P], daily maximum60.39 lb/d≤ 2.25 lb/d2584%
April 2026Turbidity, daily maximum1.72 NTU≤ .5 NTU—
April 2026pH, minimum7.07 SU≥ 7.6 SU—
May 2026Nitrogen, ammonia total [as NH4], daily maximum670 ug/L≤ 5 ug/L13300%
May 2026Nitrogen, total [as N], daily maximum426.54 lb/d≤ 13.51 lb/d3057%
May 2026Phosphorus, total [as P], daily maximum26.09 lb/d≤ 2.25 lb/d1060%
May 2026Turbidity, daily maximum1.38 NTU≤ .5 NTU—
May 2026pH, minimum7.09 SU≥ 7.6 SU—
June 2026Nitrogen, ammonia total [as NH4], daily maximum700 ug/L≤ 5 ug/L13900%
June 2026Nitrogen, total [as N], daily maximum260.04 lb/d≤ 13.51 lb/d1825%
June 2026Phosphorus, total [as P], daily maximum12.4 lb/d≤ 2.25 lb/d451%
June 2026Turbidity, daily maximum1.8 NTU≤ .5 NTU—
June 2026pH, minimum7.12 SU≥ 7.6 SU—
July 2026Nitrogen, ammonia total [as NH4], daily maximum1440 ug/L≤ 5 ug/L28700%
July 2026Nitrogen, total [as N], daily maximum210.9 lb/d≤ 13.51 lb/d1461%
July 2026Phosphorus, total [as P], daily maximum40.08 lb/d≤ 2.25 lb/d1681%
July 2026Turbidity, daily maximum2.12 NTU≤ .5 NTU—
July 2026pH, minimum7.11 SU≥ 7.6 SU—
August 2026Nitrogen, ammonia total [as NH4], daily maximum2320 ug/L≤ 5 ug/L46300%
August 2026Nitrogen, total [as N], daily maximum245.99 lb/d≤ 13.51 lb/d1721%
August 2026Phosphorus, total [as P], daily maximum64.88 lb/d≤ 2.25 lb/d2784%
August 2026Turbidity, daily maximum4.04 NTU≤ .5 NTU—
August 2026pH, minimum7.1 SU≥ 7.6 SU—

Limits in force (210)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C)all year001
Turbidityannual average≤ .2 NTUall year001
Turbiditymonthly averagereport only (NTU)all year001
Turbiditydaily maximum≤ .5 NTUall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 2251.8 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 3377.7 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year001
pHminimum≥ 7.6 SUall year001
pHmaximum≤ 8.6 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendedmonthly average≤ 2251.8 lb/dall year001
Solids, total suspendedweekly average≤ 3377.7 lb/dall year001
Solids, total suspendeddaily maximumreport only (lb/d)all year001
Nitrogen, total [as N]annual averagereport only (ug/L)all year001
Nitrogen, total [as N]monthly averagereport only (ug/L)all year001
Nitrogen, total [as N]daily maximumreport only (ug/L)all year001
Nitrogen, total [as N]monthly averagereport only (lb/d)all year001
Nitrogen, total [as N]annual geometric mean≤ 8.25 lb/dall year001
Nitrogen, total [as N]daily maximum≤ 13.51 lb/dall year001
Phosphorus, total [as P]annual averagereport only (ug/L)all year001
Phosphorus, total [as P]monthly averagereport only (ug/L)all year001
Phosphorus, total [as P]daily maximumreport only (ug/L)all year001
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Phosphorus, total [as P]annual geometric mean≤ 1.2 lb/dall year001
Phosphorus, total [as P]daily maximum≤ 2.25 lb/dall year001
Cyanide, total [as CN]daily maximum≤ 1 ug/Lall year001
Arsenic, total recoverableannual average≤ .14 ug/Lall year001
Arsenic, total recoverabledaily maximum≤ 36 ug/Lall year001
Selenium, total recoverabledaily maximum≤ 71 ug/Lall year001
Thallium, total recoverablemonthly average≤ .47 ug/Lall year001
Thallium, total recoverabledaily maximum≤ 710 ug/Lall year001
Beryllium, total recoverable [as Be]monthly average≤ .038 ug/Lall year001
Chromium, hexavalent [as Cr]daily maximum≤ 50 ug/Lall year001
Nickel, total recoverabledaily maximum≤ 8.4 ug/Lall year001
Silver total recoverabledaily maximum≤ 2.7 ug/Lall year001
Zinc, total recoverabledaily maximum≤ 91 ug/Lall year001
Cadmium, total recoverabledaily maximum≤ 9.4 ug/Lall year001
Lead, total recoverabledaily maximum≤ 5.9 ug/Lall year001
Copper, total recoverabledaily maximum≤ 3.5 ug/Lall year001
Antimony, total recoverablemonthly average≤ 640 ug/Lall year001
2,4,5-Trichlorophenoxypropionic acidmonthly average≤ 400 ug/Lall year001
2-Methyl-4,6-dinitrophenolmonthly average≤ 30 ug/Lall year001
Tributyltindaily maximum≤ .01 ug/Lall year001
Dichlorobromomethaneannual average≤ 27 ug/Lall year001
Carbon tetrachlorideannual average≤ 5 ug/Lall year001
Carbon tetrachloridedaily maximum≤ 16000 ug/Lall year001
1,2-Dichloroethaneannual average≤ 650 ug/Lall year001
1,2-Dichloroethanedaily maximum≤ 38000 ug/Lall year001
Bromoformannual average≤ 120 ug/Lall year001
Chloroformmonthly average≤ 2000 ug/Lall year001
Toluenemonthly average≤ 520 ug/Lall year001
Toluenedaily maximum≤ 2100 ug/Lall year001
Benzeneannual average≤ 16 ug/Lall year001
Benzenedaily maximum≤ 1700 ug/Lall year001
Acenaphthenemonthly average≤ 90 ug/Lall year001
Acenaphthenedaily maximum≤ 320 ug/Lall year001
Acroleindaily maximum≤ 18 ug/Lall year001
Acrylonitrileannual average≤ 7 ug/Lall year001
Anthracenemonthly average≤ 400 ug/Lall year001
Benzo[b]fluorantheneannual average≤ .0013 ug/Lall year001
Benzo[k]fluorantheneannual average≤ .013 ug/Lall year001
Benzo[a]pyreneannual average≤ .00013 ug/Lall year001
Bis[chloromethyl] etherannual average≤ .017 ug/Lall year001
Bis[2-chloroethyl] etherannual average≤ 2.2 ug/Lall year001
Bis[2-chloro-1-methylethyl] ethermonthly average≤ 4000 ug/Lall year001
Butyl benzyl phthalateannual average≤ .1 ug/Lall year001
Chlorobenzenemonthly average≤ 800 ug/Lall year001
Chlorodibromomethaneannual average≤ 21 ug/Lall year001
Chrysenedaily maximum≤ .13 ug/Lall year001
Diethyl phthalatemonthly average≤ 600 ug/Lall year001
Dimethyl phthalatemonthly average≤ 2000 ug/Lall year001
1,2-Diphenylhydrazineannual average≤ .2 ug/Lall year001
Endosulfan sulfatemonthly average≤ 40 ug/Lall year001
.beta.-Endosulfanmonthly average≤ 40 ug/Lall year001
.alpha.-Endosulfanmonthly average≤ 30 ug/Lall year001
Endrin aldehydemonthly average≤ 1 ug/Lall year001
Ethylbenzenemonthly average≤ 130 ug/Lall year001
Ethylbenzenedaily maximum≤ 140 ug/Lall year001
Fluoranthenedaily maximum≤ 13 ug/Lall year001
Fluorenemonthly average≤ 70 ug/Lall year001
Hexachlorocyclopentadienedaily maximum≤ 2 ug/Lall year001
Hexachlorobutadieneannual average≤ .01 ug/Lall year001
Hexachlorobutadienedaily maximum≤ 11 ug/Lall year001
Hexachloroethaneannual average≤ .1 ug/Lall year001
Hexachloroethanedaily maximum≤ 310 ug/Lall year001
Indeno[1,2,3-cd]pyreneannual average≤ .0013 ug/Lall year001
Isophoroneannual average≤ 1800 ug/Lall year001
Isophoronedaily maximum≤ 4300 ug/Lall year001
Methyl bromide [Bromomethane]monthly average≤ 10000 ug/Lall year001
Methylene chlorideannual average≤ 1000 ug/Lall year001
N-Nitrosodi-N-propylamineannual average≤ .51 ug/Lall year001
N-Nitrosodiphenylamineannual average≤ 6 ug/Lall year001
N-Nitrosodimethylamine [NDMA]annual average≤ 3 ug/Lall year001
Nitrobenzenemonthly average≤ 600 ug/Lall year001
Nitrobenzenedaily maximum≤ 2200 ug/Lall year001
Pyrenemonthly average≤ 30 ug/Lall year001
Tetrachloroethyleneannual average≤ 29 ug/Lall year001
Tetrachloroethylenedaily maximum≤ 145 ug/Lall year001
1,1-Dichloroethylenemonthly average≤ 20000 ug/Lall year001
1,1,1-Trichloroethanedaily maximum≤ 10400 ug/Lall year001
1,1,2-Trichloroethaneannual average≤ 8.9 mg/Lall year001
1,1,2,2-Tetrachloroethaneannual average≤ 3 ug/Lall year001
1,1,2,2-Tetrachloroethanedaily maximum≤ 3000 ug/Lall year001
Benzo[a]anthraceneannual average≤ .0013 ug/Lall year001
1,2-Dichlorobenzenemonthly average≤ 3000 ug/Lall year001
1,2-Dichloropropaneannual average≤ 31 ug/Lall year001
trans-1,2-Dichloroethylenemonthly average≤ 4000 ug/Lall year001
1,2,4-Trichlorobenzeneannual average≤ .076 ug/Lall year001
Dibenz[a,h]anthraceneannual average≤ .00013 ug/Lall year001
1,3-Dichlorobenzenemonthly average≤ 10 ug/Lall year001
1,4-Dichlorobenzenemonthly average≤ 900 ug/Lall year001
2-Chloronaphthalenemonthly average≤ 1000 ug/Lall year001
2-Chlorophenolmonthly average≤ 800 ug/Lall year001
2,4-Dichlorophenolmonthly average≤ 60 ug/Lall year001
2,4-Dimethylphenolmonthly average≤ 3000 ug/Lall year001
2,4-Dinitrotolueneannual average≤ 1.7 ug/Lall year001
2,4-Dinitrophenolmonthly average≤ 300 ug/Lall year001
2,4,6-Trichlorophenolannual average≤ 2.8 ug/Lall year001
3,3'-Dichlorobenzidineannual average≤ .15 ug/Lall year001
2,3,7,8-Tetrachlorodibenzo-p-dioxinannual average≤ .0000051 ng/Lall year001
Phenoldaily maximum≤ 170 ug/Lall year001
Naphthalenedaily maximum≤ 780 ug/Lall year001
Chlorpyrifosdaily maximum≤ .0056 ug/Lall year001
Pentachlorophenolannual average≤ .04 ug/Lall year001
Pentachlorophenoldaily maximum≤ 13 ug/Lall year001
Di[2-ethylhexyl] phthalate [DEHP]annual average≤ .37 mg/Lall year001
Di-n-butyl phthalatemonthly average≤ 30 ug/Lall year001
Benzidineannual average≤ .011 ug/Lall year001
Vinyl chlorideannual average≤ 1.6 ug/Lall year001
Trichloroethyleneannual average≤ 7 ug/Lall year001
Trichloroethylenedaily maximum≤ 700 ug/Lall year001
Aldrinannual average≤ .00000077 ug/Lall year001
Aldrindaily maximum≤ 1.3 ug/Lall year001
.alpha.-BHCannual average≤ .00039 ug/Lall year001
.beta.-BHCannual average≤ .014 ug/Lall year001
.gamma.-BHCdaily maximum≤ .16 ug/Lall year001
Chlordane [tech mix. and metabolites]annual average≤ .00032 ug/Lall year001
Chlordane [tech mix. and metabolites]daily maximum≤ .004 ug/Lall year001
DDD in whole water sampleannual average≤ .00012 ug/Lall year001
DDD in whole water sampledaily maximum≤ 1.2 ug/Lall year001
DDEannual average≤ .000018 ug/Lall year001
DDTannual average≤ .00003 ug/Lall year001
DDTdaily maximum≤ .001 ug/Lall year001
Dieldrinannual average≤ .0000012 ug/Lall year001
Dieldrindaily maximum≤ .0019 ug/Lall year001
Endosulfan, totaldaily maximum≤ .0087 ug/Lall year001
Endrindaily maximum≤ .0023 ug/Lall year001
Toxaphenedaily maximum≤ .0002 ug/Lall year001
Heptachlorannual average≤ .0000059 ug/Lall year001
Heptachlor epoxideannual average≤ .000032 ug/Lall year001
Methoxychlormonthly average≤ .02 ug/Lall year001
Methoxychlordaily maximum≤ .03 ug/Lall year001
Malathiondaily maximum≤ .1 ug/Lall year001
Demetondaily maximum≤ .1 ug/Lall year001
Guthiondaily maximum≤ .01 ug/Lall year001
Hexachlorobenzeneannual average≤ .000079 ug/Lall year001
2,4-Dichlorophenoxyacetic acidmonthly average≤ 12000 ug/Lall year001
Mirexdaily maximum≤ .001 ug/Lall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximum≤ 9 MGDall year001
Chlorine, total residualdaily maximum≤ 7.5 ug/Lall year001
2,3,5,6-Tetrachlorophenoldaily maximum≤ 440 ug/Lall year001
2,4,5-Trichlorophenolmonthly average≤ 600 ug/Lall year001
Enterococcimonthly geometric mean≤ 35 CFU/100mLall year001
Enterococcidaily maximum≤ 130 CFU/100mLall year001
4-Chloro-3-methylphenolmonthly average≤ 2000 ug/Lall year001
Nitrogen, ammonia total [as NH4]annual geometric mean≤ 2 ug/Lall year001
Nitrogen, ammonia total [as NH4]monthly averagereport only (ug/L)all year001
Nitrogen, ammonia total [as NH4]daily maximum≤ 5 ug/Lall year001
Mercury, total recoverabledaily maximum≤ .029 ug/Lall year001
Coliform, fecal generalmonthly geometric mean≤ 5.2 CFU/100mLall year001
Coliform, fecal generaldaily maximum≤ 200 CFU/100mLall year001
1,3-Dichloropropeneannual average≤ 12 ug/Lall year001
1,3-Dichloropropenedaily maximum≤ 260 ug/Lall year001
1,2,4,5-Tetrachlorobenzenemonthly average≤ .03 ug/Lall year001
Pentachlorobenzenemonthly average≤ .1 ug/Lall year001
N-Nitrosodiethylamineannual average≤ 1.2 ug/Lall year001
N-Nitrosopyrrolidineannual average≤ 34 ug/Lall year001
N-Nitrosodibutylamineannual average≤ .22 ug/Lall year001
Methylmercurymonthly average≤ .3 ug/Lall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Benzene hexachlorideannual average≤ .01 ug/Lall year001
Pentachloroethanedaily maximum< 130 ug/Lall year001
Pass/Fail Static 4 Day Chronic Raphidocelis subcapitatadaily maximum< 1 pass=0;fail=1all year001
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily maximum< 1 pass=0;fail=1all year001
Pass/Fail Static Renewal 7Day Chronic Pimephales promelasdaily maximum< 1 pass=0;fail=1all year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all yearINF
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d)all yearINF
BOD, 5-day, 20 deg. Cweekly averagereport only (lb/d)all yearINF
pHminimumreport only (SU)all yearINF
pHmaximumreport only (SU)all yearINF
Solids, total suspendeddaily maximumreport only (lb/d)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF
Solids, total suspendedweekly averagereport only (mg/L)all yearINF
Solids, total suspendeddaily maximumreport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (lb/d)all yearINF
Solids, total suspendedweekly averagereport only (lb/d)all yearINF
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all yearINF

How strict are these limits?

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

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