Sewer overflows in North Carolina

Name: Sewer overflow events in North Carolina
Creator: Sewage Monitor

Sewer overflow record — reported spills, the worst utilities, and how often overflows reached waterways in North Carolina.

Reported events

3,210

Total volume

90.6M gal

Reached waterways

2,792(87%)

Latest event

Jun 4, 2026

Worst utilities in North Carolina

Ranked by number of reported overflow events.

#	Utility	Events	Volume	Reached water
1	Charlotte Water Collection System	298	2.6M gal	294
2	Greensboro Collection System	174	880K gal	152
3	Winston-Salem Collection System	161	1.1M gal	143
4	Raleigh Collection System	106	1.8M gal	85
5	Harnett County Collection System	97	371K gal	74
6	Asheboro Collection System	83	939K gal	82
7	MSD Buncombe County Collection System	71	129K gal	71
8	Hickory Collection System	67	1.9M gal	63
9	Durham Collection System	60	7.7M gal	53
10	Henderson Collection System	59	1.3M gal	59
11	Kannapolis Collection System	51	922K gal	51
12	Lumberton Collection System	51	1.4M gal	47
13	High Point Collection System	50	202K gal	48
14	Gastonia Collection System	46	552K gal	45
15	Rocky Mount Collection System	46	4.9M gal	38
16	Albemarle Collection System	45	241K gal	45
17	Liberty Collection System	45	161K gal	43
18	Union County Collection System	45	638K gal	42
19	Wilson Collection System	45	781K gal	37
20	PWC/Fayetteville Collection System	44	703K gal	37
21	Yadkin Valley Sewer Authority WWTP	44	278K gal	42
22	Shelby Collection System	40	1.9M gal	37
23	Thomasville Collection System	37	165K gal	35
24	Brunswick County Collection System	36	513K gal	17
25	Mooresville Collection System	30	71K gal	28
26	Roanoke Rapids Sanitary Dist Collection System	30	373K gal	27
27	Eden Collection System	27	120K gal	24
28	Conover Collection System	26	353K gal	25
29	Sanford Collection System	26	11K gal	26
30	Salisbury Collection System	24	370K gal	23

The largest single reported overflow events.

15.1M galSep 26, 2024
Waynesville Collection System
Reached Richland Creek
6.8M galJul 6, 2025
Hillsborough Collection System
Reached Eno River
6.8M galJul 7, 2025
Durham Collection System
Reached Eno River
4.0M galJan 5, 2023
Angier Collection System
Reached West Buies Creek
2.7M galJul 7, 2025
OWASA Collection System
1.8M galNov 13, 2025
Hickory Collection System
Reached Lyle Creek - 11-76-(4.5)
1.7M galJul 25, 2024
Rocky Mount Collection System
Reached TAR RIVER
1.3M galAug 14, 2023
Moore County Collection System
1.1M galDec 17, 2023
Mount Olive Collection System
Reached Northeast Cape Fear River
1.1M galDec 29, 2023
Charlotte Water Collection System
Reached West Branch Rocky River