Clean Water Act discharge permit · NPDES NC0030716

CENTRAL JOHNSTON COUNTY WWTP, Smithfield, NC: NPDES NC0030716 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MajorDischarger class
15Pollutants under a numeric limit
3Pollutants with an effluent exceedance
1Inspections on file
0Formal enforcement actions

CENTRAL JOHNSTON COUNTY WWTP, held by Johnston County Public Utilities, holds NPDES permit NC0030716. EPA’s file records it issued May 21, 2021 and expiring March 31, 2026.

CENTRAL JOHNSTON COUNTY WWTP, Smithfield, North Carolina: Individual permit NC0030716, held by Johnston County Public Utilities; Publicly owned treatment works; Effective; issued May 21, 2021, term to March 31, 2026; Sewage Treatment Facilities.

Mercury, total [as Hg]: 0 limits, 11 violations of any kind, 11 effluent exceedances, latest August 31, 2006, largest 1,925% over the limit.
Flow, in conduit or thru treatment plant: 1 limit, 10 violations of any kind, 3 effluent exceedances, latest December 31, 2025, largest 8% over the limit.
BOD, 5-day, 20 deg. C: 5 limits, 59 violations of any kind, 1 effluent exceedance, latest October 31, 2016, largest 4% over the limit.
Nitrogen, total [as N]: 2 limits, 144 violations of any kind, 0 effluent exceedances.
Solids, total suspended: 3 limits, 47 violations of any kind, 0 effluent exceedances.
Nitrogen, ammonia total [as N]: 4 limits, 13 violations of any kind, 0 effluent exceedances.
Phosphorus, total [as P]: 1 limit, 5 violations of any kind, 0 effluent exceedances.
Flow, total: 1 limit, 5 violations of any kind, 0 effluent exceedances.
Coliform, fecal MF, MFC broth, 44.5 C: 2 limits, 2 violations of any kind, 0 effluent exceedances.
pH: 2 limits, 0 violations of any kind, 0 effluent exceedances.
Temperature, water deg. centigrade: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Conductivity: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Oxygen, dissolved [DO]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Nitrogen, Kjeldahl, total [as N]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Nitrite + Nitrate total [as N]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Chlorine, total residual: 1 limit, 0 violations of any kind, 0 effluent exceedances.

June 25, 2026: Audit (S).

North Carolina holds 95 Publicly owned treatment works coverages of this permit type in EPA’s file; 82 were issued before NC0030716. Johnston County Public Utilities holds 4 permits in North Carolina.

Other permits held by Johnston County Public Utilities

NEUSE RIVER WASTEWATER PUMP STATION, Smithfield: NCC261777, issued July 1, 2026
CENTRAL JOHNSTON COUNTY WWTP, Smithfield: NCG110077, issued June 1, 2023
JOHNSTON COUNTY LANDFILL, Smithfield: NCG120087, issued July 1, 2021

Coverages issued nearest NC0030716

March 2, 2021: GUNPOWDER CREEK WWTP, Hudson, NC0023736, held by City of Lenoir
March 31, 2021: WARRENTON WWTP, Warrenton, NC0020834, held by Town of Warrenton
March 31, 2021: FRANKLIN COUNTY WWTP, Franklinton, NC0069311, held by Franklin County
May 12, 2021: THURMAN STREET WWTP, North Wilkesboro, NC0020761, held by Town of North Wilkesboro
May 21, 2021: NORTHEAST WWTP, Hickory, NC0020401, held by City of Hickory
May 25, 2021: SCOTLAND NECK WWTP, Scotland Neck, NC0023337, held by Town of Scotland Neck
June 2, 2021: WASHINGTON WWTP, Washington, NC0020648, held by City of Washington
June 22, 2021: LOWER CREEK WWTP, Lenoir, NC0023981, held by City of Lenoir
June 28, 2021: ENFIELD WWTP, Enfield, NC0025402, held by Town of Enfield
August 19, 2021: COOLEEMEE WWTP, Cooleemee, NC0024872, held by Davie County

CENTRAL JOHNSTON COUNTY WWTP among its neighbors

EPA’s permit file holds 19 discharge permits in the Upper Falling Creek subwatershed (HUC 030202011403), NC0030716 among them.

Other permits in the Upper Falling Creek subwatershed (HUC 030202011403)

210 WASTEWATER TREATMENT FACILITY, Smithfield: NCG110165, minor permit, permit term to February 28, 2029
BAILEY FEED MILL, INC., Selma: NCG060314, minor permit, permit term to June 30, 2026
BRASWELL PIT, Princeton: NCG020810, minor permit, permit term to June 30, 2021
CENTRAL JOHNSTON COUNTY WWTP, Smithfield: NCG110077, minor permit, permit term to May 31, 2028
CONCRETE SUPPLY CO LLC-SMITHFIELD, Smithfield: NCG140036, minor permit, permit term to June 30, 2022
HOUSE AUTRY MILLS INC, Four Oaks: NCG060433, minor permit, permit term to June 30, 2026
JAMES PAUL EDWARDS INCORPORATED-BROGDEN PIT, Smithfield: NCG020319, minor permit, permit term to June 30, 2025
JOHNSTON COUNTY LANDFILL, Smithfield: NCG120087, minor permit, permit term to June 30, 2026
LAMPE & MALPHRUS LUMBER-JOHNSTON, Smithfield: NCG210252, minor permit, permit term to July 31, 2023
LAMPE & MALPHRUS LUMBER-PEEDIN, Smithfield: NCG210338, minor permit, permit term to July 31, 2023

Identity

Facility as filed	CENTRAL JOHNSTON COUNTY WWTP
Permittee as filed	Johnston County Public Utilities
NPDES ID	NC0030716
Permit status	Effective
Permit type	Individual permit
Discharger class	Major discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	May 21, 2021
Expiration date	March 31, 2026
Address	Smithfield, NC 27577
Subwatershed	Upper Falling Creek (HUC 030202011403)
Program components on file	Biosolids, POTW, Pretreatment
NAICS	221320 – Sewage Treatment Facilities
SIC	4952 – Sewerage Systems

Effluent limits and exceedances

16Pollutants on file
15Under a numeric limit
9With a violation of any kind
3With an effluent exceedance

An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.

Pollutant or measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Mercury, total [as Hg]	0	11	11	August 31, 2006	1,925% over the limit
Flow, in conduit or thru treatment plant	1	10	3	December 31, 2025	8% over the limit
BOD, 5-day, 20 deg. C	5	59	1	October 31, 2016	4% over the limit
Nitrogen, total [as N]	2	144	0
Solids, total suspended	3	47	0
Nitrogen, ammonia total [as N]	4	13	0
Phosphorus, total [as P]	1	5	0
Flow, total	1	5	0
Coliform, fecal MF, MFC broth, 44.5 C	2	2	0
pH	2	0	0
Temperature, water deg. centigrade	1	0	0
Conductivity	1	0	0
Oxygen, dissolved [DO]	1	0	0
Nitrogen, Kjeldahl, total [as N]	1	0	0
Nitrite + Nitrate total [as N]	1	0	0
Chlorine, total residual	1	0	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES NC0030716.

Inspections

Date	What EPA recorded	Agency
June 25, 2026	Audit	S

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES NC0030716.

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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

This public-records page covers the NPDES discharge permit NC0030716 for the CENTRAL JOHNSTON COUNTY WWTP in Smithfield, NC, held by Johnston County Public Utilities, with a status of Effective and a Major Discharger class. The facts list 15 pollutants under a numeric limit, 3 pollutants with an effluent exceedance, and 16 pollutants on file, with the permit issued May 21, 2021 and expiring March 31, 2026.