Conserve Because You Can..

Water System Supply and Demand

Cary's main water supply is B. Everett Jordan Lake. Part of the lake's storage capacity is designated for water supply, and the State of North Carolina, NCDENR, Division of Water Resources allocates that water supply storage based on applications by water suppliers. Cary/Apex, Morrisville, RTP South, and Durham received increased allocations in July 2002:

Cary/Apex: 32% of water supply storage, or 32 million gallons per day (MGD) average annual supply
Morrisville: 3.5% of water supply storage, or 3.5 MGD average annual supply
RTP South: 3.5% of water supply storage, or 3.5 MGD average annual supply
Durham: 10% of water supply storage, or 10 MGD average annual supply

The Cary/Apex Water Treatment Facility (C/A WTF) treats water from Jordan Lake for Cary, Apex, Morrisville, RTP South and Durham. The C/A WTF began treating water for Durham after they received their allocation in July 2002. The C/A WTF was recently expanded and has a maximum daily capacity of 40 MGD.

Cary and Morrisville also have mutual support agreements with Durham to purchase up to a total of about 4 MGD if needed.

Rainfall data is from the Raleigh-Durham Airport vicinity and does not reflect local isolated showers. "T" stands for trace and is not measurable.

This site is updated daily by noon for the prior days demand. Click for Year 2000 Data    Year 2001 Data    Year 2002 Data    Year 2004

  a b c=a+b d e=c-d f g=e-f  
Day C/A WTF Production
(MGD)		 Water Purchased From
Durham
(MGD)		 Total System Demand
(MGD)		 Water Treated for Durham
(MGD)		 Apex, Cary, Morrisville,
RTP South
Use
(MGD)		 Apex
Use
(MGD)		 Cary, Morrisville,
RTP South
Use
(MGD)		 Rainfall (Inches)
31-Dec 11.8 0 11.8 0 11.8 2.2 9.6 0
30-Dec 11.9 0 11.9 0 11.9 2.5 9.4 0.01
29-Dec 13.0 0 13.0 0 13.0 2.5 10.5 0
28-Dec 11.4 0 11.4 0 11.4 2.1 9.3 0
27-Dec 11.7 0 11.7 0 11.7 2.1 9.6 0
26-Dec 10.9 0 10.9 0 10.9 2.3 8.6 0
25-Dec 9.5 0 9.5 0 9.5 1.3 8.2 0
24-Dec 12.3 0 12.3 0 12.3 1.8 10.5 0.15
23-Dec 13.1 0 13.1 0 13.1 2.1 11.0 0.01
22-Dec 11.9 0 11.9 0 11.9 2.4 9.5 0
21-Dec 12.7 0 12.7 0 12.7 1.5 11.2 0
20-Dec 12.0 0 12.0 0 12.0 1.7 10.3 0
19-Dec 12.1 0 12.1 0 12.1 2.2 9.9 T
18-Dec 12.1 0 12.1 0 12.1 2.4 9.7 0
17-Dec 11.5 0 11.5 0 11.5 1.9 9.6 0.38
16-Dec 12.1 0 12.1 0 12.1 2.7 9.4 T
15-Dec 11.8 0 11.8 0 11.8 2.2 9.6 0
14-Dec 12.6 0 12.6 0 12.6 2.7 9.9 0.86
13-Dec 12.3 0 12.3 0 12.3 1.7 10.6 0.12
12-Dec 12.0 0 12.0 0 12.0 2.1 9.9 0
11-Dec 11.9 0 11.9 0 11.9 1.4 10.5 0
10-Dec 11.7 0 11.7 0 11.7 2.7 9.0 1.13
09-Dec 12.6 0 12.6 0 12.6 2.3 10.3 0
08-Dec 11.8 0 11.8 0 11.8 1.8 10.0 0
07-Dec 12.0 0 12.0 0 12.0 1.9 10.1 0
06-Dec 12.9 0 12.9 0 12.9 2.0 10.9 T
05-Dec 11.7 0 11.7 0 11.7 1.9 9.8 0.02
04-Dec 11.2 0 11.2 0 11.2 1.9 9.3 0.84
03-Dec 11.9 0 11.9 0 11.9 1.7 10.2 0
02-Dec 12.0 0 12.0 0 12.0 2.3 9.7 0
01-Dec 13.1 0 13.1 0 13.1 2.7 10.4 0
30-Nov 12.7 0 12.7 0 12.7 2.3 10.4 0
29-Nov 11.1 0 11.1 0 11.1 2.4 8.8 0
28-Nov 10.5 0 10.5 0 10.5 1.9 8.6 0.42
27-Nov 11.2 0 11.2 0 11.2 1.6 9.6 0
26-Nov 12.9 0 12.9 0 12.9 2.8 10.1 0
25-Nov 12.8 0 12.8 0 12.8 2.8 10.0 0
24-Nov 13.0 0 13.0 0 13.0 2.4 10.6 T
23-Nov 14.2 0 14.2 0 14.2 3.1 11.1 0
22-Nov 13.5 0 13.5 0 13.5 3.3 10.2 0
21-Nov 13.0 0 13.0 0 13.0 2.8 10.2 0
20-Nov 13.3 0 13.3 0 13.3 3.1 10.2 0
19-Nov 12.7 0 12.7 0 12.7 2.3 10.0 0
18-Nov 12.7 0 12.7 0 12.7 1.6 11.1 0
17-Nov 13.0 0 13.0 0 13.0 2.5 10.5 T
16-Nov 14.2 0 14.2 0 14.2 2.8 11.4 T
15-Nov 12.9 0 12.9 0 12.9 2.3 10.6 T
14-Nov 12.7 0 12.7 0 12.7 2.3 10.4 0
13-Nov 13.2 0 13.2 0 13.2 2.1 11.1 0
12-Nov 14.1 0 14.1 0 14.1 2.1 12.0 0
11-Nov 13.1 0 13.1 0 13.1 2.4 10.7 0
10-Nov 12.6 0 12.6 0 12.6 2.0 10.6 0
09-Nov 12.8 0 12.8 0 12.8 1.4 11.4 0
08-Nov 12.5 0 12.5 0 12.5 1.9 10.6 0.12
07-Nov 12.5 0 12.5 0 12.5 2.3 10.2 0.01
06-Nov 14.4 0 14.4 0 14.4 2.0 12.4 0.30
05-Nov 14.0 0 14.0 0 14.0 2.1 11.9 0
04-Nov 14.8 0 14.8 0 14.8 2.6 12.2 T
03-Nov 14.0 0 14.0 0 14.0 2.8 11.2 0
02-Nov 15.9 0 15.9 0 15.9 3.1 12.8 0
01-Nov 14.5 0 14.5 0 14.5 2.7 11.8 0
31-Oct 13.8 0 13.8 0 13.8 2.5 11.3 0
30-Oct 13.4 0 13.4 0 13.4 2.3 11.1 0
29-Oct 13.0 0 13.0 0 13.0 2.4 10.6 0.25
28-Oct 14.0 0 14.0 0 14.0 2.4 11.6 0.01
27-Oct 12.7 0 12.7 0 12.7 2.1 10.6 0.1
26-Oct 15.4 0 15.4 0 15.4 2.4 13.0 0.12
25-Oct 15.3 0 15.3 0 15.3 2.4 12.9 0
24-Oct 15.0 0 15.0 0 15.0 2.4 12.6 0
23-Oct 15.0 0 15.0 0 15.0 2.6 12.4 0
22-Oct 15.5 0 15.5 0 15.5 2.2 13.3 0
21-Oct 15.7 0 15.7 0 15.7 2.3 13.4 0
20-Oct 13.8 0 13.8 0 13.8 2.4 11.3 0
19-Oct 15.3 0 15.3 0 15.3 2.2 13.1 0
18-Oct 13.9 0 13.9 0 13.9 2.5 11.4 0
17-Oct 14.4 0 14.4 0 14.4 2.3 12.1 0.01
16-Oct 14.3 0 14.3 0 14.3 3.1 11.2 0
15-Oct 14.0 0 14.0 0 14.0 3.0 11.0 0
14-Oct 14.1 0 14.1 0 14.1 2.7 11.4 0.48
13-Oct 13.9 0 13.9 0 13.9 2.7 11.2 0
12-Oct 14.2 0 14.2 0 14.2 2.4 11.8 0
11-Oct 12.8 0 12.8 0 12.8 20. 10.8 0.02
10-Oct 12.9 0 12.9 0 12.9 2.4 10.5 0.22
09-Oct 13.4 0 13.4 0 13.4 2.6 10.8 0.11
08-Oct 15.7 0 15.7 0 15.7 3.0 12.7 0.19
07-Oct 17.0 0 17.0 0 17.0 2.7 14.3 T
06-Oct 15.3 0 15.3 0 15.3 3.0 12.3 T
05-Oct 15.0 0 15.0 0 15.0 3.0 12.0 0
04-Oct 18.6 0 18.6 0 18.6 4.0 14.6 0
03-Oct 17.5 0 17.5 0 17.5 4.0 13.5 0
02-Oct 17.0 0 17.0 0 17.0 3.4 13.6 0
01-Oct 16.1 0 16.1 0 16.1 3.0 13.1 T
30-Sept 15.9 0 15.9 0 15.9 2.9 13.0 0
29-Sept 14.1 0 14.1 0 14.1 2.5 11.6 0
28-Sept 16.4 0 16.4 0 16.4 2.9 13.5 0
27-Sept 15.1 0 15.1 0 15.1 2.6 12.5 0
26-Sept 14.9 0 14.9 0 14.9 2.6 12.3 0
25-Sept 14.3 0 14.3 0 14.3 2.6 11.7 0
24-Sept 14.3 0 14.3 0 14.3 2.6 11.7 0
23-Sept 13.5 0.0 13.5 0 13.5 2.7 10.8 0.93
22-Sept 13.4 0.0 13.4 0 13.4 3.0 10.4 0.41
21-Sept 15.8 0.0 15.8 0 15.8 2.9 12.9 T
20-Sept 15.0 0.0 15.0 0 15.0 2.8 12.2 0
19-Sept 13.4 0.0 13.4 0 13.4 2.3 11.1 T
18-Sept 14.2 0.0 14.2 0 14.2 2.3 11.9 1.62
17-Sept 14.6 0.0 14.6 0 14.6 2.0 12.6 0
16-Sept 15.8 0.0 15.8 0 15.8 2.4 13.4 0.02
15-Sept 14.6 0.0 14.6 0 14.6 2.8 11.8 0
14-Sept 15.4 0.0 15.4 0 15.4 2.6 12.8 T
13-Sept 14.8 0.0 14.8 0 14.8 2.4 12.4 0.05
12-Sept 15.2 0.0 15.2 0 15.2 2.6 12.6 0.02
11-Sept 14.6 0.0 14.6 0 14.6 2.3 12.3 0
10-Sept 14.0 0.0 14.0 0 14.0 2.2 11.8 0
09-Sept 13.6 0.0 13.6 0 13.6 2.2 11.4 0
08-Sept 13.2 0.0 13.2 0 13.2 2.0 11.2 0.63
07-Sept 15.2 0.0 16.2 0 16.2 2.6 13.6 0
06-Sept 14.2 0.0 14.2 0 14.2 2.1 12.1 0
05-Sept 13.6 0.0 13.6 0 13.6 2.0 11.6 0
04-Sept 15.1 0.0 15.1 0 15.1 2.5 12.6 .80
03-Sept 16.4 0.0 16.4 0 16.4 2.9 13.5 0
02-Sept 15.0 0.0 15.0 0 15.0 2.6 12.4 0
01-Sept 14.9 0.0 14.9 0 14.9 2.9 12.0 1.10
31-Aug 15.6 0.0 15.6 0 15.6 2.7 12.9 1.29
30-Aug 18.6 0.0 18.6 0 18.6 3.6 15.0 T
29-Aug 18.8 0.0 18.8 0 18.8 3.8 15.0 0
28-Aug 18.3 0.0 18.3 0 18.3 3.2 15.1 0
27-Aug 18.3 0.0 18.3 0 18.3 2.9 15.4 0
26-Aug 16.8 0.0 16.8 0 16.8 3.0 13.8 0
25-Aug 14.4 0.0 14.4 0 14.4 2.3 12.1 0
24-Aug 15.7 0.0 15.7 0 15.7 2.6 13.1 0
23-Aug 15.0 0.0 15.0 0 15.0 2.6 2.5 0
22-Aug 14.7 0.0 14.7 0 14.7 2.0 12.7 1.02
21-Aug 15.5 0.0 15.5 0 15.5 2.5 13.0 0
20-Aug 14.5 0.0 14.5 0 14.5 2.3 12.2 0
19-Aug 14.4 0.0 14.4 0 14.4 2.5 11.9 0
18-Aug 13.9 0.0 13.9 0 13.9 2.5 11.4 0.04
17-Aug 14.7 0.0 14.7 0 14.7 2.4 12.3 0.01
16-Aug 14.7 0.0 14.7 0 14.7 2.1 12.6 0.34
15-Aug 14.5 0.0 14.5 0 14.5 2.4 12.1 1.98
14-Aug 14.3 0.0 14.3 0 14.3 2.5 11.8 0.06
13-Aug 15.1 0.0 15.1 0 15.1 2.3 12.8 0.18
12-Aug