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    Year 2001   Year 2002    Year 2003   Year 2004   Year 2005   Year 2007

  a b c=a+b d e=c-d f h=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)		 Total Apex Use
(MGD)		 Cary, Morrisville,
RTP South
Use
(MGD)		 Rainfall (Inches)
01-Jan 12.6 0 12.6 0 12.6 1.2 11.3 0.45
31-Dec 12.3 0 12.3 0 12.3 1.7 10.6 T
30-Dec 13.7 0 13.7 0 13.7 2.9 10.8 0
29-Dec 13.1 0 13.1 0 13.1 2.5 10.6 0
28-Dec 13.7 0 13.7 0 13.7 2.0 11.7 0
27-Dec 10.9 0 10.9 0 10.9 1.8 9.1 0
26-Dec 12.4 0 12.4 0 12.4 2.6 9.8 T
25-Dec 12.0 0 12.0 0 12.0 1.9 10.1 1.51
24-Dec 12.7 0 12.7 0 12.7 2.2 10.5 0
23-Dec 12.0 0 12.0 0 12.0 2.2 9.9 0
22-Dec 12.9 0 12.9 0 12.9 1.5 11.3 0.94
21-Dec 14.9 0 14.9 0 14.9 3.2 11.8 0.01
20-Dec 13.0 0 13.0 0 13.0 2.5 10.5 0
19-Dec 13.9 0 13.9 0 13.9 2.2 11.7 0
18-Dec 13.6 0 13.6 0 13.6 1.9 11.7 0
17-Dec 14.0 0 14.0 0 14.0 2.7 11.3 0
16-Dec 14.0 0 14.0 0 14.0 2.8 11.2 0
15-Dec 13.5 0 13.5 0 13.5 2.3 11.3 0
14-Dec 13.8 0 13.8 0 13.8 2.4 11.4 0
13-Dec 13.7 0 13.7 0 13.7 2.0 11.7 T
12-Dec 14.0 0 14.0 0 14.0 2.4 11.6 0
11-Dec 13.5 0 13.5 0 13.5 2.5 11.0 0
10-Dec 13.4 0 13.4 0 13.4 2.3 11.1 0
09-Dec 13.5 0 13.5 0 13.5 2.3 11.2 0
08-Dec 12.8 0 12.8 0 12.8 2.1 10.6 0
07-Dec 13.9 0 13.9 0 13.9 2.3 11.6 0
06-Dec 13.6 0 13.6 0 13.6 2.5 11.1 0
05-Dec 13.4 0 13.4 0 13.4 2.3 11.1 0
04-Dec 13.1 0 13.1 0 13.1 2.4 10.7 0
03-Dec 13.8 0 13.8 0 13.8 2.1 11.6 0.32
02-Dec 12.7 0 12.7 0 12.7 1.8 10.9 0
01-Dec 14.5 0 14.5 0 14.5 3.0 11.5 0.23
30-Nov 13.8 0 13.8 0 13.8 2.4 11.4 0.03
29-Nov 14.2 0 14.2 0 14.2 2.4 11.9 0
28-Nov 13.4 0 13.4 0 13.4 2.0 11.4 0
27-Nov 14.9 0 14.9 0 14.9 2.7 12.3 0
26-Nov 13.5 0 13.5 0 13.5 2.4 11.1 0
25-Nov 12.7 0 12.7 0 12.7 2.2 10.5 0
24-Nov 12.0 0 12.0 0 12.0 1.6 10.4 0
23-Nov 14.2 0 14.2 0 14.2 2.8 11.4 0
22-Nov 12.8 0 12.8 0 12.8 2.2 10.6 1.46
21-Nov 13.8 0 13.8 0 13.8 2.4 11.4 1.24
20-Nov 13.2 0 13.2 0 13.2 2.2 11.0 0
19-Nov 13.9 0 13.9 0 13.9 1.8 12.0 T
18-Nov 14.4 0 14.4 0 14.4 2.4 12.0 0
17-Nov 13.8 0 13.8 0 13.8 2.8 11.0 0
16-Nov 14.2 0 14.2 0 14.2 2.6 11.7 2.36
15-Nov 14.0 0 14.0 0 14.0 2.4 11.6 0
14-Nov 14.7 0 14.7 0 14.7 3.3 11.4 0
13-Nov 16.5 0 16.5 0 16.5 3.0 13.5 0
12-Nov 13.6 0 13.6 0 13.6 2.4 11.2 1.48
11-Nov 14.5 0 14.5 0 14.5 2.5 11.9 0
10-Nov 14.0 0 14.0 0 14.0 1.9 12.1 0
09-Nov 14.9 0 14.9 0 14.9 2.9 12.0 0
08-Nov 14.9 0 14.9 0 14.9 2.6 12.3 0.05
07-Nov 14.2 0 14.2 0 14.2 2.2 12.0 2.4
06-Nov 14.4 0 14.4 0 14.4 1.9 12.4 0
05-Nov 16.0 0 16.0 0 16.0 2.3 13.7 0
04-Nov 14.3 0 14.3 0 14.3 2.1 12.3 0
03-Nov 16.9 0 16.9 0 16.9 3.6 13.3 0
02-Nov 16.0 0 16.0 0 16.0 2.6 13.3 0
01-Nov 14.9 0 14.9 0 14.9 2.4 12.5 0
31-Oct 15.3 0 15.3 0 15.3 2.2 13.1 0
30-Oct 16.5 0 16.5 0 16.5 3.5 13.0 0
29-Oct 14.3 0 14.3 0 14.3 2.6 11.8 0
28-Oct 16.0 0 16.0 0 16.0 2.4 13.6 0.22
27-Oct 14.2 0 14.2 0 14.2 2.1 12.1 0.65
26-Oct 14.5 0 14.5 0 14.5 1.7 12.7 0
25-Oct 17.4 0 17.4 0 17.4 3.8 13.6 0
24-Oct 15.5 0 15.5 0 15.5 2.7 12.8 0
23-Oct 14.4 0 14.4 0 14.4 2.5 11.9 0
22-Oct 16.0 0 16.0 0 16.0 3.0 13.0 0.16
21-Oct 15.7 0 15.7 0 15.7 2.4 13.3 0
20-Oct 15.5 0 15.5 0 15.5 3.0 12.5 0.26
19-Oct 15.4 0 15.4 0 15.4 2.4 12.9 0
18-Oct 14.3 0 14.3 0 14.3 2.1 12.1 0.08
17-Oct 15.6 0 15.6 0 15.6 2.4 13.2 1.0
16-Oct 17.3 0 17.3 0 17.3 3.0 14.2 0.26
15-Oct 16.7 0 16.7 0 16.7 2.7 14.0 0
14-Oct 16.2 0 16.2 0 16.2 2.6 13.6 0
13-Oct 17.8 0 17.8 0 17.8 3.7 14.1 0
12-Oct 14.9 0 14.9 0 14.9 1.5 13.4 0.02
11-Oct 18.0 0 18.0 0 18.0 3.8 14.2 0
10-Oct 15.6 0 15.6 0 15.6 2.6 12.9 0
09-Oct 14.7 0 14.7 0 14.7 1.9 12.8 0.04
08-Oct 14.4 0 14.4 0 14.4 2.5 11.9 0.03
07-Oct 15.4 0 15.4 0 15.4 2.3 13.1 0.41
06-Oct 17.8 0 17.8 0 17.8 2.9 14.9 0.6
05-Oct 20.3 0 20.3 0 20.3 3.4 16.9 0
04-Oct 19.9 0 19.9 0 19.9 3.5 16.4 0
03-Oct 19.6 0 19.6 0 19.6 3.1 16.4 0
02-Oct 17.7 0 17.7 0 17.7 3.6 14.1 0
01-Oct 19.1 0 19.1 0 19.1 3.5 15.6 T
30-Sept 16.8 0 16.8 0 16.8 3.1 13.7 T
29-Sept 14.7 0 14.7 0 14.7 2.3 12.4 T
28-Sept 19.8 0 19.8 0 19.8 3.5 16.3 1.0
27-Sept 19.8 0 19.8 0 19.8 3.9 15.9 0
26-Sept 18.7 0 18.7 0 18.7 3.2 15.5 0
25-Sept 15.0 0 15.0 0 15.0 2.3 12.7 0.12
24-Sept 20.2 0 20.2 0 20.2 3.1 17.0 0.65
23-Sept 19.8 0 19.8 0 19.8 4.3 15.5 0
22-Sept 19.5 0 19.5 0 19.5 3.4 16.0 0
21-Sept 18.7 0 18.7 0 18.7 3.3 15.4 0
20-Sept 15.7 0 15.7 0 15.7 2.1 13.7 0
19-Sept 17.7 0 17.7 0 17.7 2.6 15.1 0.84
18-Sept 17.5 0 17.5 0 17.5 3.9 13.6 0
17-Sept 18.9 0 18.9 0 18.9 3.2 15.7 0
16-Sept 17.3 0 17.3 0 17.3 2.7 14.6 0
15-Sept 16.2 0 16.2 0 16.2 2.7 13.4 0
14-Sept 13.9 0 13.9 0 13.9 2.1 11.8 0.27
13-Sept 18.9 0 18.9 0 18.9 3.3 15.6 0.52
12-Sept 18.8 0 18.8 0 18.8 3.0 15.8 0
11-Sept 15.5 0 15.5 0 15.5 2.1 13.4 0
10-Sept 19.6 0 19.6 0 19.6 3.4 16.1 0
09-Sept 19.1 0 19.1 0 19.1 3.7 15.4 0
08-Sept 18.4 0 18.4 0 18.4 3.3 15.1 0
07-Sept 16.4 0 16.4 0 16.4 2.8 13.6 0
06-Sept 15.7 0 15.7 0 15.7 2.6 13.1 0.04
05-Sept 16.1 0 16.1 0 16.1 2.4 13.7 0.23
04-Sept 15.4 0 15.4 0 15.4 3.2 12.2 3.83
03-Sept 16.5 0 16.5 0 16.5 3.1 13.4 0
02-Sept 14.7 0 14.7 0 14.7 2.5 12.1 0
01-Sept 15.0 0 15.0 0 15.0 2.5 12.5 1.03
31-Aug 15.4 0 15.4 0 15.4 2.3 13.0 0.54
30-Aug 18.9 0 18.9 0 18.9 3.0 15.9 1.61
29-Aug 21.8 0 21.8 0 21.8 3.7 18.1 T
28-Aug 19.0 0 19.0 0 19.0 3.7 15.3 0
27-Aug 24.0 0 24.0 0 24.0 4.0 20.0 0
26-Aug 24.0 0 24.0 0 24.0 4.0 20.0 0
25-Aug 23.3 0 23.3 0 23.3 4.7 18.6 0
24-Aug 22.3 0 22.3 0 22.3 3.7 18.6 0
23-Aug 19.5 0 19.5 0 19.5 2.7 16.8 0
22-Aug 19.4 0 19.4 0 19.4 3.1 16.3 0.10
21-Aug 17.6 0 17.6 0 17.6 3.5 14.2 0.41
20-Aug 21.4 0 21.4 0 21.4 4.0 17.4 T
19-Aug 19.8 0 19.8 0 19.8 3.7 16.2 0
18-Aug 21.7 0 21.7 0 21.7 3.4 18.3 0.53
17-Aug 21.3 0 21.3 0 21.3 4.0 17.4 0
16-Aug 21.2 0 21.2 0 21.2 3.7 17.5 0
15-Aug 21.0 0 21.0 0 21.0 3.5 17.4 0
14-Aug 17.6 0 17.6 0 17.6 3.0 14.5 0
13-Aug 19.6 0 19.6 0 19.6 3.0 16.6 0
12-Aug 19.1 0 19.1 0 19.1 3.4 15.7 0.01
11-Aug 19.8 0 19.8 0 19.8 3.4 16.4 T
10-Aug 20.7 0 20.7 0 20.7 3.5 17.2 0
09-Aug 20.0 0 20.0 0 20.0 3.2 16.8 0
08-Aug 17.8 0 17.8 0 17.8 3.2 14.6 0
07-Aug 18.1 0 18.1 0 18.1 4.2 13.9 0.93
06-Aug 21.9 0 21.9 0 21.9 4.1 17.8 0
05-Aug 21.9 0 21.9 0 21.9 4.1 17.7 T
04-Aug 21.7 0 21.7 0 21.7 3.7 18.0 0
03-Aug 22.1 0 22.1 0 22.1 4.3 17.8 0.22
02-Aug 22.0 0 22.0 0 22.0 4.5 17.5 0
01-Aug 21.2 0 21.2 0 21.2 3.7 17.5 0.07
31-Jul 17.4 0 17.4 0 17.4 3.0 14.4 0
30-Jul 19.2 0 19.2 0 19.2 3.6 15.6 0
29-Jul 19.3 0 19.3 0 19.3 3.5 15.8 0.2
28-Jul 17.8 0 17.8 0 17.8 3.3 14.5 0
27-Jul 17.8 0 17.8 0 17.8 3.1 14.7 0.01
26-Jul 15.8 0 15.8 0 15.8 2.0 13.8 0
25-Jul 18.4 0 18.4 0 18.4 3.3 15.1 1.61
24-Jul 15.9 0 15.9 0 15.9 2.9 13.0 0
23-Jul 18.3 0 18.3 0 18.3 2.9 15.5 0.3
22-Jul 19.9 0 19.9 0 19.9 3.5 16.5 0.05
21-Jul 21.2 0 21.2 0 21.2 3.3 17.9 0
20-Jul 18.2 0 18.2 0 18.2 3.8 14.4 0
19-Jul 21.1 0 21.1 0 21.1 4.2 16.9 0.03
18-Jul 22.2 0 22.2 0 22.2 3.3 18.9 T
17-Jul 18.4 0 18.4 0 18.4 3.1 15.3 0
16-Jul 20.6 0 20.6 0 20.6 3.7 16.9 0
15-Jul 19.1 0 19.1 0 19.1 3.2 15.9 T
14-Jul 17.0 0 17.0 0 17.0 2.9 14.1 T
13-Jul 21.8 0 21.8 0 21.8 3.9 17.9 0.22
12-Jul 19.6 0 19.6 0 19.6 3.1 16.5 0
11-Jul 20.9 0 20.9 0 20.9 3.4 17.5 0
10-Jul 17.1 0 17.1 0 17.1 3.3 13.7 0
09-Jul 17.7 0 17.7 0 17.7 3.2 14.5 0
08-Jul 16.9 0 16.9 0 16.9 2.9 14.0 0
07-Jul 14.7 0 14.7 0 14.7 2.1 12.6 0
06-Jul 14.7 0 14.7 0 14.7 2.3 12.3 1.06
05-Jul 19.8 0 19.8 0 19.8 3.5 16.2 1.0
04-Jul 19.3 0 19.3 0 19.3 3.9 15.4 0
03-Jul 15.4 0 15.4 0 15.4 3.1 12.3 0
02-Jul 17.1 0 17.1 0 17.1 2.9 14.3 0
01-Jul 18.9 0 18.9 0 18.9 4.0 15.0 0
30-Jun 17.8 0 17.8 0 17.8 3.0 14.8 0
29-Jun 15.8 0 15.8 0 15.8 2.8 13.1 0
28-Jun 15.1 0 15.1 0 15.1 2.4 12.7 0
27-Jun 14.4 0 14.4 0 14.4 1.8 12.5 0.58
26-Jun 15.6 0 15.6 0 15.6 3.5 12.1 0.16
25-Jun 15.3 0 15.3 0 15.3 2.6 12.7 0.76
24-Jun 15.8 0 15.8 0 15.8 2.4 13.4 0
23-Jun 19.0 0 19.0 0 19.0 3.4 15.6 0.54
22-Jun 18.1 0 18.1 0 18.1 2.6 15.5 0
21-Jun 21.1 0 21.1 0 21.1 4.5 16.6 T
20-Jun 18.7 0 18.7 0 18.7 3.5 15.2 0
19-Jun 16.5 0 16.5 0 16.5 3.0 13.5 0
18-Jun 17.0 0 17.0 0 17.0 3.1 13.9 0
17-Jun 16.7 0 16.7 0 16.7 3.0 13.7 0
16-Jun 16.5 0 16.5 0 16.5 2.8 13.8 0
15-Jun 14.7 0 14.7 0 14.7 2.5 12.2 0
14-Jun 14.3 0 14.3 0 14.3 2.1 12.1 5.64