N.J. Admin. Code § 5:21-5.2 - Capacity

(a) The water supply system shall be adequate to handle the necessary flow, based on complete development of the tract.

(b) When plans for future development necessitate oversizing of the water supply system, the municipality or utility authority may enter into an agreement with the developer to address the fair share of the costs.

(c) The demand rates for all uses shall be considered in computing the total system demand. Where fire protection is provided in accordance with (e) below, the system shall be capable of providing the required fire demand plus the required maximum daily residential demand, or the required fire demand plus the peak hour flows in Table 5.2, whichever is greater. The maximum daily demand shall be calculated by multiplying the average daily residential demand indicated in Table 5.1 by a factor of 1.5.

(d) Average daily residential consumption shall be computed in accordance with the housing unit type and size data shown in Table 5.1. The peak daily flows shall be computed by applying a peaking factor of three times the average daily residential consumption. The municipality may require deviations in the peaking factor value provided appropriate documentation and justification for the deviation from the standards is provided.

(e) The design of the on-site water distribution system shall be adequate to provide fire protection as per ISO standard, Fire Suppression Rating Schedule, or per AWWA M31, "Manual of Water Supply Practices--Distribution System Requirements for Fire Protection," ISO method on pages 3-9, incorporated herein by reference.

Table 5.1 Water Demand by House Type and Size

House type and size	Water Demand/ gallons per day
Single-family detached
2 bedroom	150
3 bedroom	225
4 bedroom	395
5 bedroom	475
Townhouse
1 bedroom	120
2 bedroom	140
3 bedroom	200
4 bedroom	255
Low and mid-rise (up to nine stories)
1 bedroom	95
2 bedroom	140
95	215
High-rise (10 or more stories)
studio	65
1 bedroom	80
2 bedroom	130
Mobile home
1 bedroom	120
2 bedroom	140
3 bedroom	245

TABLE 5.2
DESIGN STANDARDS FOR PEAK HOUR FLOW
Peak hourly rates
Total houses served	(gallons per minute per house)
5	8.0
10	5.0
50	3.0
100	2.0
250	1.3
500	0.8
750	0.7
1,000 or more	0.6

Source: "Water Needs Through 2040 for New Jersey Public Community Water Supply Systems," by Daniel Van Abs, Jiayil Ding, and Eric Pierson, Rutgers University, 2018. Study commissioned by the New Jersey Department of Environmental Protection.

Notes

N.J. Admin. Code § 5:21-5.2

Amended by R.1999 d.374, effective 11/1/1999 (operative May 1, 2000).
See: 31 N.J.R. 477(a), 31 N.J.R. 3259(a).
Rewrote (c); and in Table 5.2, added Peak Hourly Rate for 1,000 or more Total Houses Served.
Amended by R.2009 d.185, effective 6/15/2009.
See: 41 N.J.R. 913(a), 41 N.J.R. 2463(a).
In (c), inserted "the required fire demand plus" and substituted "in Table 5.2" for "indicated in Table 5.2 below". Amended by 52 N.J.R. 1997(a), effective 11/2/2020