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

  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)
31-Dec 13.53 0 13.53 0 13.53 2.94 10.59 0.02
30-Dec 11.95 0 11.95 0 11.95 2.26 9.69 0
29-Dec 13.3 0 13.3 0 13.3 2.4 10.9 0.02
28-Dec 11.5 0 11.5 0 11.5 1.8 9.6 0.23
27-Dec 12.4 0 12.4 0 12.4 2.1 10.4 0
26-Dec 11.6 0 11.6 0 11.6 2.0 9.6 T
25-Dec 11.0 0 11.0 0 11.0 2.2 8.8 0.34
24-Dec 12.2 0 12.2 0 12.2 2.3 9.9 0
23-Dec 12.5 0 12.5 0 12.5 2.2 10.4 0
22-Dec 13.0 0 13.0 0 13.0 2.5 10.5 0
21-Dec 13.3 0 13.3 0 13.3 2.5 10.8 0
20-Dec 12.9 0 12.9 0 12.9 2.4 10.5 0
19-Dec 12.4 0 12.4 0 12.4 2.2 10.2 0
18-Dec 12.6 0 12.6 0 12.6 2.2 10.4 0.25
17-Dec 13.0 0 13.0 0 13.0 2.3 10.7 T
16-Dec 13.7 0 13.7 0 13.7 2.5 11.1 0
15-Dec 12.5 0 12.5 0 12.5 2.2 10.3 1.41
14-Dec 12.3 0 12.3 0 12.3 2.2 10.1 0
13-Dec 12.6 0 12.6 0 12.6 2.3 10.3 0
12-Dec 13.2 0 13.2 0 13.2 2.5 10.7 0
11-Dec 12.5 0 12.5 0 12.5 2.4 10.1 T
10-Dec 13.0 0 13.0 0 13.0 2.1 10.9 0.25
09-Dec 12.8 0 12.8 0 12.8 2.3 10.5 0
08-Dec 12.5 0 12.5 0 12.5 2.1 10.3 0
07-Dec 12.8 0 12.8 0 12.8 2.0 10.8 0.01
06-Dec 12.0 0 12.0 0 12.0 2.1 9.9 T
05-Dec 13.0 0 13.0 0 13.0 2.3 10.7 1.35
04-Dec 12.8 0 12.8 0 12.8 2.3 10.5 0.14
03-Dec 12.0 0 12.0 0 12.0 2.2 9.8 0.01
02-Dec 14.1 0 14.1 0 14.1 2.2 11.9 0
01-Dec 14.2 0 14.2 0 14.2 2.3 12.0 0
29-Nov 13.8 0 13.8 0 13.8 2.2 11.6 0.77
28-Nov 14.5 0 14.5 0 14.5 2.3 12.2 0.4
27-Nov 14.7 0 14.7 0 14.7 2.4 12.3 0.6
26-Nov 13.2 0 13.2 0 13.2 2.0 11.2 0
25-Nov 11.9 0 11.9 0 11.9 2.0 9.9 0
24-Nov 13.7 0 13.7 0 13.7 2.2 11.4 0
23-Nov 14.7 0 14.7 0 14.7 2.2 12.6 T
22-Nov 14.8 0 14.8 0 14.8 2.3 12.5 0.27
21-Nov 14.3 0 14.3 0 14.3 2.4 11.9 1.72
20-Nov 13.8 0 13.8 0 13.8 2.5 11.3 0.07
19-Nov 13.0 0 13.0 0 13.0 2.0 10.9 0
18-Nov 14.2 0 14.2 0 14.2 2.7 11.4 0
17-Nov 12.4 0 12.4 0 12.4 1.9 10.5 0
16-Nov 16.0 0 16.0 0 16.0 2.9 13.1 0.14
15-Nov 15.3 0 15.3 0 15.3 2.5 12.9 T
14-Nov 15.3 0 15.3 0 15.3 2.7 12.6 0
13-Nov 16.4 0 16.4 0 16.4 3.2 13.2 0
12-Nov 16.6 0 16.6 0 16.6 2.9 13.6 0
11-Nov 15.1 0 15.1 0 15.1 2.4 12.7 0
10-Nov 15.7 0 15.7 0 15.7 2.6 13.1 0
09-Nov 17.9 0 17.9 0 17.9 3.3 14.6 0
08-Nov 17.1 0 17.1 0 17.1 2.9 14.1 0
07-Nov 15.4 0 15.4 0 15.4 2.6 12.8 0
06-Nov 18.0 0 18.0 0 18.0 3.1 14.8 0
05-Nov 19.4 0 19.4 0 19.4 3.8 15.5 0
04-Nov 15.2 0 15.2 0 15.2 3.1 12.0 0
03-Nov 16.8 0 16.8 0 16.8 2.9 13.9 0
02-Nov 16.9 0 16.9 0 16.9 3.0 13.9 0
01-Nov 16.9 0 16.9 0 16.9 2.7 14.2 0
31-Oct 16.0 0 16.0 0 16.0 3.3 12.7 0
30-Oct 18.2 0 18.2 0 18.2 3.0 15.1 0
29-Oct 17.2 0 17.2 0 17.2 3.5 13.7 0
28-Oct 16.7 0 16.7 0 16.7 2.4 14.3 T
27-Oct 17.2 0 17.2 0 17.2 3.0 14.2 0
26-Oct 17.4 0 17.4 0 17.4 3.2 14.2 0
25-Oct 17.5 0 17.5 0 17.5 3.1 14.4 0
24-Oct 16.2 0 16.2 0 16.2 2.6 13.5 T
23-Oct 17.1 0 17.1 0 17.1 3.3 13.8 0
22-Oct 15.8 0 15.8 0 15.8 2.4 13.4 0.01
21-Oct 19.1 0 19.1 0 19.1 3.6 15.5 0.1
20-Oct 19.7 0 19.7 0 19.7 3.6 16.0 0
19-Oct 18.8 0 18.8 0 18.8 3.4 15.4 0
18-Oct 19.4 0 19.4 0 19.4 3.4 15.9 0
17-Oct 15.3 0 15.3 0 15.3 2.4 12.9 0
16-Oct 18.6 0 18.6 0 18.6 3.5 15.1 0
15-Oct 17.9 0 17.9 0 17.9 3.8 14.1 0
14-Oct 17.7 0 17.7 0 17.7 2.9 14.8 0
13-Oct 16.2 0 16.2 0 16.2 2.7 13.6 0
12-Oct 14.3 0 14.3 0 14.3 2.4 11.9 0.01
11-Oct 13.9 0 13.9 0 13.9 2.1 11.8 T
10-Oct 13.4 0 13.4 0 13.4 2.1 11.3 0.01
09-Oct 13.8 0 13.8 0 13.8 2.4 11.4 0.01
08-Oct 14.3 0 14.3 0 14.3 2.3 12.0 0.61
07-Oct 14.0 0 14.0 0 14.0 2.5 11.5 0.98
06-Oct 16.7 0 16.7 0 16.7 2.5 14.1 0.26
05-Oct 18.6 0 18.6 0 18.6 3.0 15.6 0.07
04-Oct 20.1 0 20.1 0 20.1 3.5 16.7 T
03-Oct 18.0 0 18.0 0 18.0 3.4 14.6 0
02-Oct 21.3 0 21.3 0 21.3 4.0 17.3 0
01-Oct 20.2 0 20.2 0 20.2 3.8 16.4 0
30-Sept 20.6 0 20.6 0 20.6 3.9 16.7 0
29-Sept 20.7 0 20.7 0 20.7 3.7 17.0 0
28-Sept 20.0 0 20.0 0 20.0 3.6 16.4 0
27-Sept 18.8 0 18.8 0 18.8 3.3 15.5 0
26-Sept 16.6 0 16.6 0 16.6 2.9 13.8 0.05
25-Sept 20.9 0 20.9 0 20.9 3.8 17.1 0
24-Sept 19.3 0 19.3 0 19.3 3.0 16.3 0
23-Sept 19.2 0 19.2 0 19.2 4.2 15.1 0
22-Sept 17.4 0 17.4 0 17.4 3.6 13.8 0
21-Sept 15.9 0 15.9 0 15.9 3.4 12.5 0
20-Sept 20.5 0 20.5 0 20.5 3.1 17.5 0.61
19-Sept 18.6 0 18.6 0 18.6 4.4 14.3 0
18-Sept 22.6 0 22.6 0 22.6 4.9 17.6 0
17-Sept 20.8 0 20.8 0 20.8 3.5 17.3 0
16-Sept 19.7 0 19.7 0 19.7 3.3 16.3 0.01
15-Sept 19.0 0 19.0 0 19.0 3.1 15.9 0
14-Sept 18.7 0 18.7 0 18.7 3.4 15.3 0.03
13-Sept 19.5 0 19.5 0 19.5 3.0 16.5 0.12
12-Sept 18.4 0 18.4 0 18.4 3.8 14.7 0
11-Sept 21.1 0 21.1 0 21.1 3.2 17.9 0
10-Sept 21.9 0 21.9 0 21.9 4.0 17.9 0
09-Sept 20.9 0 20.9 0 20.9 3.9 17.0 0
08-Sept 21.1 0 21.1 0 21.1 4.4 18.7 0
07-Sept 20.2 0 20.2 0 20.2 3.9 16.3 0
06-Sept 20.5 0 20.5 0 20.5 3.9 16.5 0
05-Sept 17.9 0 17.9 0 17.9 3.5 14.4 0.01
04-Sept 19.4 0 19.4 0 19.4 3.9 15.5 0
03-Sept 20.1 0 20.1 0 20.1 3.9 16.2 0
02-Sept 21.5 0 21.5 0 21.5 4.7 16.8 0
01-Sept 21.4 0 21.4 0 21.4 4.3 17.1 0
31-Aug 19.0 0 19.0 0 19.0 3.7 15.3 T
30-Aug 18.4 0 18.4 0 18.4 3.6 14.8 0.16
29-Aug 17.2 0 17.2 0 17.2 3.4 13.8 0
28-Aug 19.2 0 19.2 0 19.2 3.3 15.9 0
27-Aug 18.3 0 18.3 0 18.3 3.4 15.0 0
26-Aug 18.0 0 18.0 0 18.0 3.8 14.2 0
25-Aug 18.1 0 18.1 0 18.1 3.2 15.0 0
24-Aug 17.1 0 17.1 0 17.1 2.2 14.9 0
23-Aug 17.4 0 17.4 0 17.4 3.8 13.6 0.2
22-Aug 15.7 0 15.7 0 15.7 2.8 12.9 0
21-Aug 18.6 0 18.6 0 18.6 3.4 15.2 0.01
20-Aug 18.2 0 18.2 0 18.2 3.2 15.0 0
19-Aug 19.9 0 19.9 0 19.9 2.7 17.2 0
18-Aug 17.0 0 17.0 0 17.0 3.1 13.8 T
17-Aug 16.4 0 16.4 0 16.4 2.5 13.8 0.10
16-Aug 18.6 0 18.6 0 18.6 3.3 15.3 0.15
15-Aug 16.6 0 16.6 0 16.6 3.2 13.5 0
14-Aug 17.0 0 17.0 0 17.0 2.8 15.0 0
13-Aug 18.4 0 18.4 0 18.4 3.8 14.6 0.45
12-Aug 17.7 0 17.7 0 17.7 2.7 15.0 0.15
11-Aug 16.7 0 16.7 0 16.7 2.9 13.8 0.08
10-Aug 15.0 0 15.0 0 15.0 2.8 12.2 0.48
09-Aug 17.2 0 17.2 0 17.2 3.2 14.0 2.03
08-Aug 16.5 0 16.5 0 16.5 2.9 13.6 0
07-Aug 19.8 0 19.8 0 19.8 3.0 16.8 0.1
06-Aug 19.6 0 19.6 0 19.6 3.4 16.2 0
05-Aug 20.3 0 20.36 0 20.3 4.1 16.2 0
04-Aug 18.5 0 18.5 0 18.5 2.6 15.9 0
03-Aug 20.1 0 20.1 0 20.1 3.7 16.3 0
02-Aug 17.4 0 17.4 0 17.4 2.8 14.6 0
01-Aug 15.0 0 15.0 0 15.0 2.9 12.0 0.01
31-July 14.9 0 14.9 0 14.9 2.6 12.3 0.68
30-July 14.8 0 14.8 0 14.8 2.5 12.3 0.23
29-July 15.6 0 15.6 0 15.6 2.5 13.1 0.17
28-July 20.7 0 20.7 0 20.7 3.7 17.1 2.08
27-July 22.6 0 22.6 0 22.6 4.2 18.4 0
26-July 21.3 0 21.3 0 21.3 4.0 17.3 0
25-July 17.9 0 17.9 0 17.9 3.7 14.3 0
24-July 18.2 0 18.2 0 18.2 3.5 14.7 0
23-July 15.4 0 15.4 0 15.4 2.7 12.7 0
22-July 18.1 0 18.1 0 18.1 2.6 15.4 0
21-July 20.9 0 20.9 0 20.9 4.3 16.7 0.14
20-July 15.8 0 15.8 0 15.8 1.8 15.5 0.07
19-July 22.2 0 22.2 0 22.2 4.4 17.8 1.96
18-July 18.0 0 18.0 0 18.0 3.8 14.3 0
17-July 23.6 0 23.6 0 23.6 1.8 21.8 0.1
16-July 21.1 0 21.1 0 21.1 4.1 16.9 0
15-July 18.2 0 18.2 0 18.2 3.6 14.6 T
14-July 17.7 0 17.7 0 17.7 3.1 14.6 T
13-July 19.5 0 19.5 0 19.5 2.3 17.2 T
12-July 19.5 0 19.5 0 19.5 3.7 15.8 T
11-July 17.2 0 17.2 0 17.2 3.3 15.6 0
10-July 19.1 0 19.1 0 19.1 3.4 15.6 0
09-July 16.8 0 16.8 0 16.8 3.8 13.4 0
08-July 14.5 0 14.5 0 14.5 2.2 12.3 0
07-July 18.0 0 18.0 0 18.0 2.9 15.1 1.85
06-July 18.0 0 18.0 0 18.0 2.7 15.3 0.24
05-July 17.9 0 17.9 0 17.9 2.9 15.1 0.01
04-July 14.5 0 14.5 0 14.5 3.0 11.5 T
03-July 17.1 0 17.1 0 17.1 3.6 13.5 T
02-July 18.9 0 18.9 0 18.9 3.8 15.1 0.08
01-July 20.0 0 20.0 0 20.1 4.4 15.6 T
30-Jun 17.6 0 17.6