Tesoro Refining — NPDES permit ND0000248: limits, due date and EPA's record

NPDES permit ND0000248 · Major NON-POTW · effective, expires 2028-03-31 · EPA's file as of 2026-09-19

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

Last period with anything received: 2026-07-31. Most often over: Sulfide, total [as S] (4), BOD, 5-day, 20 deg. C (1).

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among ND permits in EPA's filings — check your permit).

Limits in force (168)

Outfall	Parameter	Statistic	Limit	Months
002	BOD, 5-day, 20 deg. C	DAILY MN	report only	all year
002	BOD, 5-day, 20 deg. C	30DA AVG	<= 25 mg/L	all year
002	BOD, 5-day, 20 deg. C	DAILY MX	<= 45 mg/L	all year
002	BOD, 5-day, 20 deg. C	30DA AVG	report only	all year
002	BOD, 5-day, 20 deg. C	DAILY MX	report only	all year
002	Oxygen demand, chem. [COD], dissolved	DAILY MN	report only	all year
002	Oxygen demand, chem. [COD], dissolved	30DA AVG	report only	all year
002	Oxygen demand, chem. [COD], dissolved	DAILY MX	report only	all year
002	Oxygen demand, chem. [COD], dissolved	30DA AVG	report only	all year
002	Oxygen demand, chem. [COD], dissolved	DAILY MX	report only	all year
002	pH	MINIMUM	>= 6 SU	all year
002	pH	MAXIMUM	<= 9 SU	all year
002	Solids, total suspended	DAILY MN	report only	all year
002	Solids, total suspended	30DA AVG	<= 30 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 45 mg/L	all year
002	Solids, total suspended	30DA AVG	report only	all year
002	Solids, total suspended	DAILY MX	report only	all year
002	Oil & Grease	DAILY MN	report only	all year
002	Oil & Grease	30DA AVG	report only	all year
002	Oil & Grease	DAILY MX	<= 10 mg/L	all year
002	Oil & Grease	30DA AVG	report only	all year
002	Oil & Grease	DAILY MX	report only	all year
002	Nitrogen, total [as N]	MINIMUM	report only	all year
002	Nitrogen, total [as N]	AVERAGE	report only	all year
002	Nitrogen, total [as N]	MAXIMUM	report only	all year
002	Nitrogen, ammonia total [as N]	DAILY MN	report only	all year
002	Nitrogen, ammonia total [as N]	30DA AVG	report only	all year
002	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
002	Nitrogen, ammonia total [as N]	30DA AVG	report only	all year
002	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
002	Phosphorus, total [as P]	MINIMUM	report only	all year
002	Phosphorus, total [as P]	AVERAGE	report only	all year
002	Phosphorus, total [as P]	MAXIMUM	report only	all year
002	Sulfide, total [as S]	DAILY MN	report only	all year
002	Sulfide, total [as S]	30DA AVG	report only	all year
002	Sulfide, total [as S]	DAILY MX	report only	all year
002	Sulfide, total [as S]	30DA AVG	report only	all year
002	Sulfide, total [as S]	DAILY MX	report only	all year
002	Chloride [as Cl]	DAILY MN	report only	all year
002	Chloride [as Cl]	30DA AVG	report only	all year
002	Chloride [as Cl]	DAILY MX	report only	all year
002	Chloride [as Cl]	MINIMUM	report only	all year
002	Chloride [as Cl]	AVERAGE	report only	all year
002	Chloride [as Cl]	MAXIMUM	report only	all year
002	Chromium, hexavalent [as Cr]	DAILY MN	report only	all year
002	Chromium, hexavalent [as Cr]	30DA AVG	report only	all year
002	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
002	Chromium, hexavalent [as Cr]	30DA AVG	report only	all year
002	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
002	Chromium, total [as Cr]	DAILY MN	report only	all year
002	Chromium, total [as Cr]	30DA AVG	report only	all year
002	Chromium, total [as Cr]	DAILY MX	report only	all year
002	Chromium, total [as Cr]	30DA AVG	report only	all year
002	Chromium, total [as Cr]	DAILY MX	report only	all year
002	Flow, in conduit or thru treatment plant	30DA AVG	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
002	Sulfates, total [as SO4]	DAILY MN	report only	all year
002	Sulfates, total [as SO4]	30DA AVG	report only	all year
002	Sulfates, total [as SO4]	DAILY MX	report only	all year
002	Sulfates, total [as SO4]	MINIMUM	report only	all year
002	Sulfates, total [as SO4]	AVERAGE	report only	all year
002	Sulfates, total [as SO4]	MAXIMUM	report only	all year
002	Phenolic compounds, unchlorinated	DAILY MN	report only	all year
002	Phenolic compounds, unchlorinated	30DA AVG	report only	all year
002	Phenolic compounds, unchlorinated	DAILY MX	report only	all year
002	Phenolic compounds, unchlorinated	30DA AVG	report only	all year
002	Phenolic compounds, unchlorinated	DAILY MX	report only	all year
002	Flow, total	MO TOTAL	report only	all year
002	Toxic Units Static 48HR Acute Ceriodaphnia dubia	DAILY MX	<= 1 tox acute	all year
002	TU LC50 Static Renewal 96Hr Acute Pimephales promelas	DAILY MX	<= 1 tox acute	all year
003	BOD, 5-day, 20 deg. C	30DA AVG	<= 939.1 lb/d	all year
003	BOD, 5-day, 20 deg. C	30DA AVG	<= 349.53 lb/d	all year
003	BOD, 5-day, 20 deg. C	DAILY MX	<= 1701.2 lb/d	all year
003	BOD, 5-day, 20 deg. C	DAILY MX	<= 629.16 lb/d	all year
003	Oxygen demand, chem. [COD], dissolved	30DA AVG	<= 2440.37 lb/d	all year
003	Oxygen demand, chem. [COD], dissolved	DAILY MX	<= 4702.79 lb/d	all year
003	Solids, total suspended	30DA AVG	<= 279.63 lb/d	all year
003	Solids, total suspended	30DA AVG	<= 762 lb/d	all year
003	Solids, total suspended	DAILY MX	<= 438.5 lb/d	all year
003	Solids, total suspended	DAILY MX	<= 1188.9 lb/d	all year
003	Oil & Grease	30DA AVG	<= 281.2 lb/d	all year
003	Oil & Grease	30DA AVG	<= 101.68 lb/d	all year
003	Oil & Grease	DAILY MX	<= 539.1 lb/d	all year
003	Oil & Grease	DAILY MX	<= 190.65 lb/d	all year
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 190.7 lb/d	all year
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 190.65 lb/d	all year
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 419.4 lb/d	all year
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 419.44 lb/d	all year
003	Sulfide, total [as S]	30DA AVG	<= 1.84 lb/d	all year
003	Sulfide, total [as S]	30DA AVG	<= 1.8 lb/d	all year
003	Sulfide, total [as S]	DAILY MX	<= 4.13 lb/d	all year
003	Sulfide, total [as S]	DAILY MX	<= 4.1 lb/d	all year
003	Chromium, hexavalent [as Cr]	30DA AVG	<= .206 lb/d	all year
003	Chromium, hexavalent [as Cr]	30DA AVG	<= .8 lb/d	all year
003	Chromium, hexavalent [as Cr]	DAILY MX	<= .465 lb/d	all year
003	Chromium, hexavalent [as Cr]	DAILY MX	<= 1.9 lb/d	all year
003	Chromium, total [as Cr]	30DA AVG	<= 11.9 lb/d	all year
003	Chromium, total [as Cr]	30DA AVG	<= 2.539 lb/d	all year
003	Chromium, total [as Cr]	DAILY MX	<= 23.3 lb/d	all year
003	Chromium, total [as Cr]	DAILY MX	<= 7.269 lb/d	all year
003	Phenolic compounds, unchlorinated	30DA AVG	<= 2.142 lb/d	all year
003	Phenolic compounds, unchlorinated	30DA AVG	<= 5.9 lb/d	all year
003	Phenolic compounds, unchlorinated	DAILY MX	<= 8.886 lb/d	all year
003	Phenolic compounds, unchlorinated	DAILY MX	<= 16.7 lb/d	all year
003	Chemical Oxygen Demand [COD]	30DA AVG	<= 6460.4 lb/d	all year
003	Chemical Oxygen Demand [COD]	DAILY MX	<= 12742.8 lb/d	all year
006	BOD, 5-day, 20 deg. C	DAILY MN	report only	all year
006	BOD, 5-day, 20 deg. C	30DA AVG	<= 25 mg/L	all year
006	BOD, 5-day, 20 deg. C	DAILY MX	<= 45 mg/L	all year
006	BOD, 5-day, 20 deg. C	30DA AVG	report only	all year
006	BOD, 5-day, 20 deg. C	DAILY MX	report only	all year
006	Oxygen demand, chem. [COD], dissolved	DAILY MN	report only	all year
006	Oxygen demand, chem. [COD], dissolved	30DA AVG	report only	all year
006	Oxygen demand, chem. [COD], dissolved	DAILY MX	report only	all year
006	Oxygen demand, chem. [COD], dissolved	30DA AVG	report only	all year
006	Oxygen demand, chem. [COD], dissolved	DAILY MX	report only	all year
006	pH	MINIMUM	>= 6.5 SU	all year
006	pH	MAXIMUM	<= 9 SU	all year
006	Solids, total suspended	DAILY MN	report only	all year
006	Solids, total suspended	30DA AVG	<= 30 mg/L	all year
006	Solids, total suspended	DAILY MX	<= 45 mg/L	all year
006	Solids, total suspended	30DA AVG	report only	all year
006	Solids, total suspended	DAILY MX	report only	all year
006	Oil & Grease	DAILY MN	report only	all year
006	Oil & Grease	30DA AVG	report only	all year
006	Oil & Grease	DAILY MX	<= 10 mg/L	all year
006	Oil & Grease	30DA AVG	report only	all year
006	Oil & Grease	DAILY MX	report only	all year
006	Nitrogen, total [as N]	MINIMUM	report only	all year
006	Nitrogen, total [as N]	30DA AVG	report only	all year
006	Nitrogen, total [as N]	DAILY MX	report only	all year
006	Nitrogen, ammonia total [as N]	DAILY MN	report only	all year
006	Nitrogen, ammonia total [as N]	30DA AVG	report only	all year
006	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
006	Nitrogen, ammonia total [as N]	30DA AVG	report only	all year
006	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
006	Phosphorus, total [as P]	MINIMUM	report only	all year
006	Phosphorus, total [as P]	30DA AVG	report only	all year
006	Phosphorus, total [as P]	DAILY MX	report only	all year
006	Sulfide, total [as S]	DAILY MN	report only	all year
006	Sulfide, total [as S]	30DA AVG	report only	all year
006	Sulfide, total [as S]	DAILY MX	report only	all year
006	Sulfide, total [as S]	30DA AVG	report only	all year
006	Sulfide, total [as S]	DAILY MX	report only	all year
006	Chloride [as Cl]	MINIMUM	report only	all year
006	Chloride [as Cl]	30DA AVG	report only	all year
006	Chloride [as Cl]	DAILY MX	report only	all year
006	Chromium, hexavalent [as Cr]	DAILY MN	report only	all year
006	Chromium, hexavalent [as Cr]	30DA AVG	report only	all year
006	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
006	Chromium, hexavalent [as Cr]	30DA AVG	report only	all year
006	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
006	Chromium, total [as Cr]	DAILY MN	report only	all year
006	Chromium, total [as Cr]	30DA AVG	report only	all year
006	Chromium, total [as Cr]	DAILY MX	report only	all year
006	Chromium, total [as Cr]	30DA AVG	report only	all year
006	Chromium, total [as Cr]	DAILY MX	report only	all year
006	Flow, in conduit or thru treatment plant	30DA AVG	report only	all year
006	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
006	Flow, total	TOTAL	report only	all year
006	Sulfates, total [as SO4]	MINIMUM	report only	all year
006	Sulfates, total [as SO4]	30DA AVG	<= 38308 mg/L	all year
006	Sulfates, total [as SO4]	DAILY MX	<= 52642 mg/L	all year
006	Phenolic compounds, unchlorinated	DAILY MN	report only	all year
006	Phenolic compounds, unchlorinated	30DA AVG	report only	all year
006	Phenolic compounds, unchlorinated	DAILY MX	report only	all year
006	Phenolic compounds, unchlorinated	30DA AVG	report only	all year
006	Phenolic compounds, unchlorinated	DAILY MX	report only	all year