NPDES WA0020982 · Clean Water Act

CENTRALIA STP, Centralia, WA: NPDES WA0020982 discharge permit, effluent exceedances, inspections, penalties

CENTRALIA STP, Centralia, Washington: Individual permit WA0020982, held by City of Centralia; Publicly owned treatment works; Effective; issued March 26, 2021, term to April 30, 2026, by State.

Solids, total suspended: 0 limits, 1,695 violations of any kind, 4 effluent exceedances, latest December 31, 2025, largest 177% over the limit.
BOD, 5-day, 20 deg. C: 0 limits, 1,679 violations of any kind, 4 effluent exceedances, latest December 31, 2023, largest 393% over the limit.
BOD, percent removal [total]: 0 limits, 337 violations of any kind, 1 effluent exceedance, latest January 31, 2022, largest 241% over the limit.
Solids, suspended percent removal: 0 limits, 337 violations of any kind, 1 effluent exceedance, latest January 31, 2022, largest 358% over the limit.
Fecal coliform, MPN, EC med, 44.5 C: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest November 30, 2025, largest 95% over the limit.
Nitrogen, ammonia total [as N]: 0 limits, 1,213 violations of any kind.
Flow: 0 limits, 1,082 violations of any kind.
pH: 0 limits, 600 violations of any kind.
Coliform, fecal general: 0 limits, 360 violations of any kind.
Temperature, water deg. centigrade: 0 limits, 241 violations of any kind.
Chlorine, total residual: 0 limits, 149 violations of any kind.
Thallium, total [as Tl]: 0 limits, 15 violations of any kind.
Zinc, total [as Zn]: 0 limits, 15 violations of any kind.
Arsenic, total [as As]: 0 limits, 14 violations of any kind.
Beryllium, total [as Be]: 0 limits, 14 violations of any kind.
Cadmium, total [as Cd]: 0 limits, 14 violations of any kind.
Chromium, total [as Cr]: 0 limits, 14 violations of any kind.
Copper, total [as Cu]: 0 limits, 14 violations of any kind.
Lead, total [as Pb]: 0 limits, 14 violations of any kind.
Nickel, total [as Ni]: 0 limits, 14 violations of any kind.
Silver, total [as Ag]: 0 limits, 14 violations of any kind.
Antimony, total [as Sb]: 0 limits, 14 violations of any kind.
Selenium, total [as Se]: 0 limits, 14 violations of any kind.
Mercury, total [as Hg]: 0 limits, 14 violations of any kind.
Chromium, hexavalent [as Cr]: 0 limits, 11 violations of any kind.
Chromium, hexavalent dissolved [as Cr]: 0 limits, 3 violations of any kind.
Di[2-ethylhexyl] phthalate [DEHP]: 0 limits, 2 violations of any kind.
Oxygen, dissolved percent saturation: 0 limits, 1 violation of any kind.

November 3, 2026: Agency Enforcement Review (State).
April 6, 2026: Agency Enforcement Review (State).
March 4, 2026: Letter of Violation/ Warning Letter (State).
March 2, 2026: Evaluation (S).
January 29, 2026: Letter of Violation/ Warning Letter (State).

Washington holds 238 Publicly owned treatment works coverages of this permit type in EPA’s file; 231 were issued before WA0020982. City of Centralia holds 2 permits in Washington.

Other permits held by City of Centralia

CENTRALIA CITY, Centralia: WAR045027, issued 2019-07-01

Coverages issued nearest WA0020982

2021-01-29: BIRCH BAY WWTP, Blaine: WA0029556, held by Birch Bay Water & Sewer Dist
2021-01-29: SKAGIT COUNTY SEWER DIST 2 BIG LAKE WWTP, Mount Vernon: WA0030597, held by Skagit County Sewer District No. 2
2021-02-11: SUMNER STP, Sumner: WA0023353, held by City of Sumner
2021-02-19: THREE RIVERS REGIONAL WASTEWATER PLANT, Longview: WA0037788, held by Three Rivers Regional Wastewater Authority
2021-02-24: WARM BEACH CAMPGROUND WWTP, Stanwood: WA0029904, held by Warm Beach Christian Camp
2021-05-19: SNOQUALMIE WWTP AND RECLAIM FACILITY, Snoqualmie: WA0022403, held by Snoqualmie Wastewater & Water Reclamation Facility
2021-07-08: FREEMAN SCHOOL DISTRICT 358, Rockford: WA0045403, held by Freeman School District 358
2021-09-24: KING COUNTY CARNATION WWTP, Carnation: WA0032182, held by King County Wastewater Treatment Division
2022-03-28: LANGLEY STP, Langley: WA0020702, held by Langley City of
2022-04-12: CATHLAMET STP, Cathlamet: WA0022667, held by Town of Cathlamet

CENTRALIA STP among its neighbors

23 discharge permits are in the Scammon Creek-Shehalis River subwatershed (HUC 171001030404); WA0020982 is one. Its county: 160, 4 major; WA0020982 is major permit.

Other permits in the Scammon Creek-Shehalis River subwatershed (HUC 171001030404)

2600 COMMERCIAL, Centralia: WAR313592, minor, term to 2025-12-31
3 SANFORDS, Centralia: WAR315129, minor, term to 2025-12-31
3408 HARRISON AVENUE, Centralia: WAR316064, minor, term to 2030-12-31
BENAROYA CENTRALIA, Centralia: WAR302244, minor, term to 2015-12-31
BIO RECYCLING CORP, Centralia: WA0026107
CENTRALIA NORTH PARCEL C FILL AND GRADE, Centralia: WAR308056, minor, term to 2025-12-31
FORDS PRAIRIE INDUSTRIAL PARK PHASE 1, Centralia: WAR314338, minor, term to 2025-12-31
GEORGIA PACIFIC CENTRALIA, Centralia: WAR312038, minor, term to 2025-12-31
JB LOGSTACKERS, Centralia: WAR000080, minor, term to 2024-12-31
LAKESIDE INDUSTRIES CENTRALIA, Centralia: WAG501187, minor, term to 2026-03-31

Identity

Facility	CENTRALIA STP
Permittee	City of Centralia
NPDES ID	WA0020982
Status	Effective
Type	Individual permit
Class	Major
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	March 26, 2021
Expires	April 30, 2026
Agency	State
Address	Centralia, WA 98531
Subwatershed	Scammon Creek-Shehalis River (HUC 171001030404)
Other EPA IDs (FRS)	RCRA handler WAD000875385

NPDES WA0020982: effluent limits and exceedances

CENTRALIA STP (NPDES WA0020982): 28 pollutants on file, 0 limited; 28 with a violation of any kind, 5 with an exceedance.

How exceedances are counted.

Pollutant	Violations	Exceedances	Latest	Largest, as filed
Solids, total suspended	1,695	4	December 31, 2025	177% over the limit
BOD, 5-day, 20 deg. C	1,679	4	December 31, 2023	393% over the limit
BOD, percent removal [total]	337	1	January 31, 2022	241% over the limit
Solids, suspended percent removal	337	1	January 31, 2022	358% over the limit
Fecal coliform, MPN, EC med, 44.5 C	1	1	November 30, 2025	95% over the limit
Nitrogen, ammonia total [as N]	1,213	0
Flow	1,082	0
pH	600	0
Coliform, fecal general	360	0
Temperature, water deg. centigrade	241	0
Chlorine, total residual	149	0
Thallium, total [as Tl]	15	0
Zinc, total [as Zn]	15	0
Arsenic, total [as As]	14	0
Beryllium, total [as Be]	14	0
Cadmium, total [as Cd]	14	0
Chromium, total [as Cr]	14	0
Copper, total [as Cu]	14	0
Lead, total [as Pb]	14	0
Nickel, total [as Ni]	14	0
Silver, total [as Ag]	14	0
Antimony, total [as Sb]	14	0
Selenium, total [as Se]	14	0
Mercury, total [as Hg]	14	0
Chromium, hexavalent [as Cr]	11	0
Chromium, hexavalent dissolved [as Cr]	3	0
Di[2-ethylhexyl] phthalate [DEHP]	2	0
Oxygen, dissolved percent saturation	1	0

NPDES WA0020982: inspections, violations and enforcement

NPDES WA0020982: 1 inspection

Date	What EPA recorded	Agency
March 2, 2026	Evaluation	S

NPDES WA0020982: 4 informal enforcement actions

Date	What EPA recorded	Agency
November 3, 2026	Agency Enforcement Review	State
April 6, 2026	Agency Enforcement Review	State
March 4, 2026	Letter of Violation/ Warning Letter	State
January 29, 2026	Letter of Violation/ Warning Letter	State

NPDES WA0020982 (CENTRALIA STP): no single-event violation and formal enforcement action on file.

Watch NPDES WA0020982

NPDES WA0020982: one email when its EPA record changes — $99/month.

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Permits near NPDES WA0020982

NPDES WA0020982: 28 pollutant rows, 5 dated events; ICIS-NPDES download, loaded September 15, 2026.