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 2006

  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 15.2 0 15.2 1.9 13.3 2.0 11.4 0
30-Dec 14.2 0 14.2 1.8 12.5 1.9 10.6 1.92
29-Dec 15.2 0 15.2 1.8 13.4 2.2 11.2 0.13
28-Dec 16.8 0 16.8 1.8 15.0 2.3 12.7 0.04
27-Dec 15.1 0 15.1 1.9 13.2 2.2 11.0 0
26-Dec 13.8 0 13.8 1.8 12.0 1.9 10.1 0.91
25-Dec 13.8 0 13.8 1.8 12.0 1.8 10.2 0
24-Dec 17.0 0 17.0 1.9 15.1 2.7 12.4 0
23-Dec 15.1 0 15.1 1.8 13.3 2.1 11.2 0.16
22-Dec 16.2 0 16.2 1.8 14.5 2.3 12.1 0
21-Dec 15.5 0 15.5 1.9 13.6 2.2 11.4 0.01
20-Dec 16.2 0 16.2 1.9 14.3 2.3 11.9 0
19-Dec 17.0 0 17.0 1.9 15.1 2.1 13.0 0.02
18-Dec 15.5 0 15.5 1.9 13.6 2.1 11.5 0
17-Dec 15.5 0 15.5 1.6 13.8 2.1 11.7 0
15-Dec 16.0 0 16.0 1.8 14.1 2.4 11.8 0.97
14-Dec 17.4 0 17.4 1.9 15.5 2.3 13.2 0
13-Dec 16.3 0 16.3 2.0 14.3 2.3 12.0 0.01
12-Dec 15.1 0 15.1 2.0 13.2 2.0 11.1 0
11-Dec 16.4 0 16.4 1.8 14.6 2.3 12.3 0
10-Dec 16.5 0 16.5 1.9 14.6 2.2 12.3 0
09-Dec 16.4 0 16.4 1.8 14.6 2.6 12.1 0
08-Dec 16.0 0 16.0 1.8 14.1 2.3 11.9 0
07-Dec 16.2 0 16.2 1.8 14.4 2.3 12.1 0
06-Dec 15.6 0 15.6 1.9 13.7 2.1 11.6 0
05-Dec 16.1 0 16.1 1.8 14.3 2.3 12.0 0
04-Dec 16.9 0 16.9 1.8 15.1 2.3 12.9 0
03-Dec 15.3 0 15.3 1.9 13.5 2.2 11.2 0.04
02-Dec 15.8 0 15.8 1.8 14.0 2.4 11.6 0
01-Dec 15.5 0 15.5 1.8 13.7 2.3 11.4 0
30-Nov 15.4 0 15.4 1.9 13.5 2.1 11.4 0
29-Nov 16.1 0 16.1 1.8 14.2 2.2 12.0 0
28-Nov 16.0 0 16.0 1.9 14.2 2.1 12.1 0
27-Nov 16.3 0 16.3 1.9 14.4 2.5 11.9 0
26-Nov 16.2 0 16.2 1.9 14.3 2.1 12.2 0.06
25-Nov 16.9 0 16.9 1.8 15.1 2.4 12.7 0.06
24-Nov 14.9 0 14.9 1.8 13.1 2.2 10.9 0
23-Nov 14.5 0 14.5 1.8 12.6 2.0 10.7 0
22-Nov 14.1 0 14.1 1.8 12.3 2.5 9.8 0
21-Nov 16.5 0 16.5 1.9 14.6 2.4 12.2 0
20-Nov 16.1 0 16.1 1.8 14.2 2.7 11.5 0
19-Nov 15.6 0 15.6 1.8 13.8 1.8 11.9 0
18-Nov 16.6 0 16.6 1.8 14.8 2.4 12.4 0
17-Nov 16.4 0 16.4 1.8 14.6 2.8 11.8 0
16-Nov 15.7 0 15.7 1.8 14.0 1.7 12.3 0
15-Nov 16.6 0 16.6 1.8 14.7 2.5 12.3 0.32
14-Nov 15.8 0 15.8 1.9 13.9 2.5 11.4 0
13-Nov 15.5 0 15.5 1.8 13.7 2.3 11.4 0
12-Nov 17.0 0 17.0 1.9 15.2 2.3 12.9 0.04
11-Nov 15.6 0 15.6 1.8 13.8 2.2 11.6 0
10-Nov 16.4 0 16.4 1.8 14.6 2.7 11.9 0
09-Nov 16.7 0 16.7 1.8 14.9 2.3 12.6 0
08-Nov 16.1 0 16.1 1.8 14.3 2.1 12.3 0
07-Nov 16.3 0 16.3 1.8 14.5 2.7 11.8 0
06-Nov 16.4 0 16.4 1.7 14.7 2.4 12.3 0
05-Nov 16.0 0 16.0 1.8 14.3 2.2 12.1 0
04-Nov 18.1 0 18.1 1.9 16.2 3.1 13.1 0
03-Nov 16.5 0 16.5 2.2 14.3 2.5 11.8 0
02-Nov 15.5 0 15.5 1.0 14.5 2.2 12.4 0
01-Nov 17.9 0 17.9 1.9 16.0 2.4 13.6 0
31-Oct 16.8 0 16.8 1.9 14.9 2.6 12.4 0
30-Oct 17.3 0 17.3 1.8 15.5 2.3 13.2 0
29-Oct 17.5 0 17.5 1.8 15.7 3.0 12.7 0
28-Oct 17.0 0 17.0 1.8 15.1 3.2 11.9 0
27-Oct 19.2 0 19.2 1.8 17.4 3.5 13.9 0.37
26-Oct 16.2 0 16.2 2.0 14.2 3.1 11.1 2.19
25-Oct 16.5 0 16.5 1.9 14.6 2.0 12.6 0.08
24-Oct 19.6 0 19.6 1.9 17.8 2.3 15.5 1.72
23-Oct 19.8 0 19.8 2.0 17.8 2.6 15.2 0
22-Oct 17.1 0 17.1 1.9 15.2 2.3 12.9 0
21-Oct 18.2 0 18.2 1.8 16.4 2.3 14.1 0
20-Oct 18.6 0 18.6 1.8 16.8 2.5 14.3 0
19-Oct 21.2 0 21.2 1.8 19.3 2.9 16.5 0.09
18-Oct 21.5 0 21.5 1.9 19.5 3.3 16.2 0.04
17-Oct 23.9 0 23.9 1.8 22.1 3.5 18.6 0
16-Oct 22.6 0 22.6 1.9 20.7 2.9 17.8 0
15-Oct 20.0 0 20.0 2.0 18.0 3.0 14.9 0
14-Oct 24.1 0 24.1 2.1 22.0 3.7 18.2 0
13-Oct 24.8 0 24.8 1.9 23.0 3.8 19.2 0
12-Oct 23.5 0 23.5 1.8 21.7 3.2 18.5 0
11-Oct 23.9 0 23.9 1.8 22.1 3.1 19.0 0
10-Oct 25.2 0 25.2 1.9 23.3 3.9 19.3 0
09-Oct 24.3 0 24.3 1.9 22.4 3.4 19.0 0
08-Oct 19.9 0 19.9 1.8 18.0 3.1 15.0 0
07-Oct 22.9 0 22.9 1.9 21.0 3.6 17.4 0
06-Oct 21.2 0 21.2 1.9 19.3 2.6 16.7 0
05-Oct 22.8 0 22.8 2.0 20.7 3.3 17.4 0.13
04-Oct 23.7 0 23.7 1.8 21.9 3.5 18.3 0
03-Oct 23.6 0 23.6 1.9 21.6 3.3 18.4 0
02-Oct 23.8 0 23.8 1.3 22.5 3.7 18.7 0
01-Oct 21.0 0 21.0 1.3 19.7 3.1 16.6 0
30-Sept 25.0 0 25.0 1.2 23.8 4.0 19.7 0
29-Sept 24.3 0 24.3 1.3 23.0 4.1 18.9 0
28-Sept 23.8 0 23.8 1.4 22.4 3.6 18.8 0
27-Sept 24.1 0 24.1 1.4 22.7 3.8 21.4 0
26-Sept 24.8 0 24.8 1.4 23.4 3.5 19.8 0
25-Sept 23.1 0 23.1 1.4 21.7 3.8 17.9 0
24-Sept 17.2 0 17.2 0 17.2 3.0 14.2 0
23-Sept 22.2 0 22.2 0 22.2 3.6 18.6 0
22-Sept 19.8 0 19.8 0 19.8 3.5 16.3 0
21-Sept 19.1 0 19.1 0 19.1 3.1 16.0 0
20-Sept 20.0 0 20.0 0 20.0 2.6 17.4 0.31
19-Sept 21.9 0 21.9 0 21.9 3.7 18.3 0
18-Sept 20.5 0 20.5 0 20.5 3.1 17.3 0
17-Sept 18.3 0 18.3 0 18.3 3.0 15.3 0
16-Sept 20.8 0 20.8 0 20.8 3.3 17.5 0
15-Sept 17.1 0 17.1 0 17.1 2.4 14.6 0
14-Sept 21.0 0 21.0 0 21.0 3.4 17.6 1.91
13-Sept 23.7 0 23.7 0 23.7 3.8 19.9 0
12-Sept 25.5 0 25.5 0 25.5 4.1 21.4 0
11-Sept 23.6 0 23.6 0 23.6 3.6 20.0 0
10-Sept 20.4 0 20.4 1.4 19.0 3.5 15.5 0
09-Sept 25.6 0 25.6 0 25.6 4.9 20.7 0
08-Sept 24.8 0 24.8 0 24.8 4.2 20.6 0
07-Sept 25.6 0 25.6 0 25.6 4.1 21.5 0
06-Sept 24.5 0 24.5 0 24.5 3.8 20.7 0
05-Sept 24.9 0 24.9 0 24.9 3.9 20.9 0
04-Sept 24.3 0 24.3 0 24.3 3.6 20.6 0
03-Sept 20.5 0 20.5 0 20.5 4.2 16.3 0
02-Sept 23.5 0 23.5 0 23.5 3.7 19.8 0
01-Sept 23.6 0 23.6 0 23.6 3.9 19.7 0
31-Aug 23.4 0 23.4 0 23.4 3.8 19.6 0
30-Aug 23.7 0 23.7 0 23.7 3.6 20.1 0
29-Aug 24.3 0 24.3 0 24.3 3.9 20.5 0
28-Aug 23.4 0 23.4 0 23.4 3.7 19.8 0
27-Aug 16.8 0 16.8 0.909 15.9 2.4 13.5 0
26-Aug 24.9 0 24.9 0 24.9 4.1 20.7 0.06
25-Aug 24.3 0 24.3 0 24.3 4.0 20.3 0
24-Aug 25.0 0 25.0 0 25.0 4.7 20.3 0
23-Aug 21.5 0 21.5 0 21.5 3.5 18.1 0.53
22-Aug 22.3 0 22.3 0 22.3 3.5 18.8 0
21-Aug 26.4 0 26.4 0 26.4 4.1 22.2 0.06
20-Aug 21.1 0 21.1 0.664 20.5 3.8 16.7 0
19-Aug 25.9 0.839 26.69 0 26.69 4.7 22.0 0
18-Aug 24.9 1.065 25.96 0 25.96 4.4 21.6 0
17-Aug 24.3 0.504 24.82 0 24.82 4.0 20.8 0.01
16-Aug 25.3 0 25.3 0 25.3 4.4 20.9 0
15-Aug 28.1 0 28.1 0 28.1 4.9 23.2 0
14-Aug 27.2 0 27.2 0 27.2 4.7 22.5 0
13-Aug 19.0 0 19.0 0 19.0 3.3 15.7 0
12-Aug 25.5 0 25.5 0 25.5 4.4 29.8 0
11-Aug 25.0 0 25.0 0 25.0 4.5 29.5 0
10-Aug 25.2 0 25.2 0 25.2 4.0 29.2 0.05
09-Aug 26.0 0 26.0 0 26.0 4.4 30.4 0
08-Aug 25.3 0 25.3 0 25.3 4.2 29.5 0.17
07-Aug 25.38 0 25.38 0 25.38 4.123 21.3 0
06-Aug 19.35 0 19.35 0 19.35 3.948 15.4 0
05-Aug 24.98 0 24.98 0 24.98 4.463 20.5 0.03
04-Aug 23.73 0 23.73 0 23.73 4.072 19.7 0
03-Aug 23.09 0 23.09 0 23.09 3.782 19.3 0
02-Aug 23.46 0 23.46 0 23.46 3.845 19.6 0
01-Aug 22.43 0 22.43 0 22.43 3.145 19.3 0
31-July 18.5 0 18.5 0 18.5 2.4 16.0 0
30-July 17.2 0 17.2 0 17.2 3.2 14.1 0.13
29-July 19.2 0 19.2 0 19.2 3.2 16.0 0
28-July 19.1 0 19.1 0 19.1 3.3 15.8 0.57
27-July 23.6 0 23.6 0 23.6 4.4 19.2 1.18
26-July 23.1 0 23.1 0 23.1 3.8 19.2 0
25-July 23.4 0 23.4 0 23.4 3.6 19.8 0
24-July 22.1 0 22.1 0 22.1 3.4 18.6 0
23-July 18.5 0 18.5 0 18.5 3.8 14.7 0
22-July 22.6 0 22.6 0 22.6 3.7 18.9 0
21-July 20.8 0 20.8 0 20.8 3.1 17.7 0
20-July 22.2 0 22.2 0 22.2 4.0 18.2 0
19-July 20.3 0 20.3 0 20.3 3.6 16.8 0
18-July 17.9 0 17.9 0 17.9 2.6 15.2 0.08
17-July 22.3 0 22.3 0 22.3 3.6 18.6 2.05
16-July 19.0 0 19.0 0 19.0 3.4 15.6 0
15-July 21.6 0 21.6 0 21.6 3.4 18.2 0
14-July 22.1 0 22.1 0 22.1 4.5 17.6 0
13-July 21.4 0 21.4 0 21.4 3.1 18.3 0
12-July 17.7 0 17.7 0 17.7 3.0 14.6 0
11-July 19.3 0 19.3 0 19.3 2.8 16.5 0.82
10-July 23.8 0 23.8 0 23.8 4.1 19.7 0.11
09-July 19.0 0 19.0 0 19.0 3.6 15.4 0
08-July 24.3 0 24.3 0 24.3 3.7 20.6 0
07-July 24.6 0 24.6 0 24.6 4.2 20.5 0
06-July 23.2 0 23.2 0 23.2 3.7 19.5 0
05-July 24.8 0 24.8 0 24.8 4.4 20.4 0
04-July 24.3 0 24.3 0 24.3 4.7 19.6 0
03-July 23.3 0 23.3 0 23.3 3.9 19.4 0
02-July 17.1 0 17.1 0 17.1 2.5 14.5 0
01-July 24.1 0 24.1 0 24.1 4.7 19.3 0
30-Jun 18.4 0 18.4 0 18.4 2.3 16.1 0
29-Jun 21.6 0 21.6 0 21.6 4.2 17.4 0.18
28-Jun 22.1 0 22.1 0 22.1 3.8 18.3 0
27-Jun 20.6 0 20.6 0 20.6 3.7 16.9 0
26-Jun 22.2 0 22.2 0 22.2 4.0 18.2 0.53
25-Jun 20.2 0 20.2 0 20.2 4.3 15.9 0
24-Jun 23.3 0 23.3 0 23.3 4.3 19.0 0.31
23-Jun 21.3 0 21.3 0 21.3 3.7 17.5 0.12
22-Jun 20.9 0 20.9 0 20.9 3.2 17.7 0.13
21-Jun 20.9 0 20.9 0 20.9 4.0 16.9 0
20-Jun 19.0 0 19.0 0 19.0 3.4 15.6 0.2
19-Jun 22.6 0 22.6 0 22.6 3.8 18.8 0.38
18-Jun 18.3 0 18.3 0 18.3 3.5 14.8 0
17-Jun 23.0 0 23.0 0 23.0 4.8 18.2 0.06
16-Jun 17.5 0 17.5 0 17.5 2.5 15.0 0.03
15-Jun 18.8 0 18.8 0 18.8 3.6 15.3 0.01
14-Jun 16.8 0 16.8 0 16.8 3.2 13.6 0.01
13-Jun 19.1 0 19.1 0 19.1 3.2 15.9 0.18
12-Jun 20.0 0 20.0 0