Hillsboro City Of — NPDES permit ND0026115: limits, due date and EPA's record

NPDES permit ND0026115 · Minor POTW · effective, expires 2028-03-31 · EPA's file as of 2026-09-19

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

Reporting

Reports are due about 31 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (144)

Outfall	Parameter	Statistic	Limit	Months
001	Stream flow, instantaneous	WD	report only	all year
001	Stream flow, instantaneous	WE	report only	all year
001	Stream flow, instantaneous	WKLY MAX	report only	all year
001	Stream flow, instantaneous	30DA AVG	report only	all year
001	Stream flow, instantaneous	DAILY MX	report only	all year
001	Oxygen, dissolved [DO]	DAILY MN	report only	all year
001	Oxygen, dissolved [DO]	30DA AVG	report only	all year
001	Oxygen, dissolved [DO]	DAILY MX	report only	all year
001	BOD, 5-day, 20 deg. C	DAILY MN	report only	all year
001	BOD, 5-day, 20 deg. C	30DA AVG	report only	all year
001	BOD, 5-day, 20 deg. C	MX 7D AV	report only	all year
001	pH	MINIMUM	report only	all year
001	pH	MAXIMUM	report only	all year
001	Solids, total suspended	DAILY MN	report only	all year
001	Solids, total suspended	30DA AVG	report only	all year
001	Solids, total suspended	DAILY MX	report only	all year
001	Flow, in conduit or thru treatment plant	30DA AVG	report only	all year
001	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
001	Chlorine, total residual	DAILY MN	report only	all year
001	Chlorine, total residual	DAILY AV	report only	all year
001	Chlorine, total residual	DAILY MX	report only	all year
001	Flow, total	TOTAL	report only	all year
002	Stream flow, instantaneous	30DA AVG	report only	all year
002	Stream flow, instantaneous	DAILY MX	report only	all year
002	Conductivity	DAILY MN	report only	all year
002	Conductivity	DAILY MN	report only	all year
002	Conductivity	DAILY AV	report only	all year
002	Conductivity	MO AVG	report only	all year
002	Conductivity	DAILY MX	report only	all year
002	Conductivity	DAILY MX	report only	all year
002	Oxygen, dissolved [DO]	DAILY MN	>= 5 mg/L	all year
002	Oxygen, dissolved [DO]	MO AVG	report only	all year
002	Oxygen, dissolved [DO]	DAILY MX	report only	all year
002	BOD, 5-day, 20 deg. C	DAILY MN	report only	all year
002	BOD, 5-day, 20 deg. C	30DA AVG	<= 30 mg/L	all year
002	BOD, 5-day, 20 deg. C	MX 7D AV	<= 45 mg/L	all year
002	pH	MINIMUM	>= 6.5 SU	all year
002	pH	MINIMUM	>= 6.5 SU	all year
002	pH	MAXIMUM	<= 9 SU	all year
002	pH	MAXIMUM	<= 9 SU	all year
002	Alkalinity, total [as CaCO3]	DAILY MN	report only	all year
002	Alkalinity, total [as CaCO3]	DAILY AV	report only	all year
002	Alkalinity, total [as CaCO3]	DAILY MX	report only	all year
002	Bicarbonate ion- [as HCO3]	DAILY MN	report only	all year
002	Bicarbonate ion- [as HCO3]	DAILY AV	report only	all year
002	Bicarbonate ion- [as HCO3]	DAILY MX	report only	all year
002	Carbonate ion- [as CO3]	DAILY MN	report only	all year
002	Carbonate ion- [as CO3]	DAILY AV	report only	all year
002	Carbonate ion- [as CO3]	DAILY MX	report only	all year
002	Solids, total suspended	DAILY MN	report only	all year
002	Solids, total suspended	MO AVG	report only	all year
002	Solids, total suspended	DAILY MX	<= 90 mg/L	all year
002	Nitrite + Nitrate total [as N]	DAILY MN	report only	all year
002	Nitrite + Nitrate total [as N]	DAILY AV	report only	all year
002	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
002	Phosphorus, total [as P]	DAILY MN	report only	all year
002	Phosphorus, total [as P]	DAILY AV	report only	all year
002	Phosphorus, total [as P]	DAILY MX	report only	all year
002	Hardness, total [as CaCO3]	DAILY MN	report only	all year
002	Hardness, total [as CaCO3]	DAILY AV	report only	all year
002	Hardness, total [as CaCO3]	DAILY MX	report only	all year
002	Hardness, total [as CaCO3]	DAILY MN	report only	all year
002	Hardness, total [as CaCO3]	DAILY AV	report only	all year
002	Hardness, total [as CaCO3]	DAILY MX	report only	all year
002	Calcium, total [as Ca]	DAILY MN	report only	all year
002	Calcium, total [as Ca]	DAILY AV	report only	all year
002	Calcium, total [as Ca]	DAILY MX	report only	all year
002	Magnesium, total [as Mg]	DAILY MN	report only	all year
002	Magnesium, total [as Mg]	DAILY AV	report only	all year
002	Magnesium, total [as Mg]	DAILY MX	report only	all year
002	Sodium, total [as Na]	DAILY MN	report only	all year
002	Sodium, total [as Na]	DAILY AV	report only	all year
002	Sodium, total [as Na]	DAILY MX	report only	all year
002	Sodium adsorption ratio	MINIMUM	report only	all year
002	Sodium adsorption ratio	AVERAGE	report only	all year
002	Sodium adsorption ratio	MAXIMUM	report only	all year
002	Sodium, %	MINIMUM	report only	all year
002	Sodium, %	AVERAGE	report only	all year
002	Sodium, %	MAXIMUM	report only	all year
002	Potassium, total [as K]	DAILY MN	report only	all year
002	Potassium, total [as K]	DAILY AV	report only	all year
002	Potassium, total [as K]	DAILY MX	report only	all year
002	Chloride [as Cl]	DAILY MN	report only	all year
002	Chloride [as Cl]	DAILY MN	report only	all year
002	Chloride [as Cl]	DAILY AV	report only	all year
002	Chloride [as Cl]	MO AVG	report only	all year
002	Chloride [as Cl]	DAILY MX	report only	all year
002	Chloride [as Cl]	DAILY MX	report only	all year
002	Sulfate, total [as SO4]	DAILY MN	report only	all year
002	Sulfate, total [as SO4]	DAILY MN	report only	all year
002	Sulfate, total [as SO4]	DAILY AV	report only	all year
002	Sulfate, total [as SO4]	MO AVG	report only	all year
002	Sulfate, total [as SO4]	DAILY MX	report only	all year
002	Sulfate, total [as SO4]	DAILY MX	report only	all year
002	Sulfate, total [as SO4]	30DA AVG	report only	all year
002	Sulfate, total [as SO4]	DAILY MX	report only	all year
002	Fluoride, total [as F]	DAILY MN	report only	all year
002	Fluoride, total [as F]	DAILY AV	report only	all year
002	Fluoride, total [as F]	DAILY MX	report only	all year
002	Silica, total [as SiO2]	DAILY MN	report only	all year
002	Silica, total [as SiO2]	DLYAVMIN	report only	all year
002	Silica, total [as SiO2]	DAILY MX	report only	all year
002	Arsenic, total [as As]	DAILY MN	report only	all year
002	Arsenic, total [as As]	MO AVG	report only	all year
002	Arsenic, total [as As]	DAILY MX	report only	all year
002	Cadmium, total [as Cd]	DAILY MN	report only	all year
002	Cadmium, total [as Cd]	DAILY AV	report only	all year
002	Cadmium, total [as Cd]	DAILY MX	report only	all year
002	Copper, total [as Cu]	DAILY MN	report only	all year
002	Copper, total [as Cu]	DAILY AV	report only	all year
002	Copper, total [as Cu]	DAILY MX	report only	all year
002	Iron, total [as Fe]	DAILY MN	report only	all year
002	Iron, total [as Fe]	DAILY AV	report only	all year
002	Iron, total [as Fe]	DAILY MX	report only	all year
002	Lead, total [as Pb]	DAILY MN	report only	all year
002	Lead, total [as Pb]	DAILY AV	report only	all year
002	Lead, total [as Pb]	DAILY MX	report only	all year
002	Manganese, total [as Mn]	DAILY MN	report only	all year
002	Manganese, total [as Mn]	DAILY AV	report only	all year
002	Manganese, total [as Mn]	DAILY MX	report only	all year
002	Nickel, total [as Ni]	DAILY MN	report only	all year
002	Nickel, total [as Ni]	DAILY AV	report only	all year
002	Nickel, total [as Ni]	DAILY MX	report only	all year
002	Zinc, total [as Zn]	DAILY MN	report only	all year
002	Zinc, total [as Zn]	DAILY AV	report only	all year
002	Zinc, total [as Zn]	DAILY MX	report only	all year
002	Selenium, total [as Se]	DAILY MN	report only	all year
002	Selenium, total [as Se]	DAILY AV	report only	all year
002	Selenium, total [as Se]	DAILY MX	report only	all year
002	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
002	Chlorine, total residual	DAILY MN	report only	all year
002	Chlorine, total residual	MO AVG	<= .958 mg/L	all year
002	Chlorine, total residual	DAILY MX	<= 1.038 mg/L	all year
002	Flow, total	TOTAL	report only	all year
002	Hydroxide	DAILY MN	report only	all year
002	Hydroxide	DAILY AV	report only	all year
002	Hydroxide	DAILY MX	report only	all year
002	Solids, total dissolved [TDS]	DAILY MN	report only	all year
002	Solids, total dissolved [TDS]	DAILY AV	report only	all year
002	Solids, total dissolved [TDS]	DAILY MX	report only	all year
002	Turbidity, lab, NTU	DAILY MN	report only	all year
002	Turbidity, lab, NTU	DAILY AV	report only	all year
002	Turbidity, lab, NTU	DAILY MX	report only	all year