N.J. Admin. Code § 7:10-12.32

Current through Register Vol. 56, No. 24, December 18, 2024

Section 7:10-12.32 - Disinfection of public noncommunity and nonpublic water systems

(a) General regulations for disinfection are as follows:

1. Disinfection shall be accomplished using chlorination, ultra-violet light, or ozonation, in accordance with the methods described in (b), (c) or (d) below.

2. The owner of any public noncommunity water system with an extensive service area shall maintain a detectable disinfectant residual in the water distribution system. For purposes of this subsection, an extensive service area is 100 service connections or 1500 linear feet of water mains or gravity storage.

3. Chlorine disinfection shall be accomplished in accordance with the chlorine contact period and residual requirements set forth in N.J.A.C. 7:10-11.16(e).

(b) Regulations for chlorination are as follows:

1. The administrative authority shall approve the use of gas chlorination for public noncommunity and nonpublic water systems only if the use of hypochlorite feed systems are impractical for the specific application.

2. The chlorinating device shall be capable of producing a chlorine residual after the contact period as required pursuant to N.J.A.C. 7:10-11.16(e)3. A chlorine residual test kit shall be used to verify that the correct application rate is maintained.

3. The chlorination device shall be protected from freezing.

4. Gas chlorinating devices shall be located in above-grade separate rooms with an outside entrance only and shall have proper ventilation including an exhaust fan near floor level with an outside switch. An observation window to permit visual inspection without opening the door of the chlorine room shall be provided. The doors of such rooms shall open outward and shall be provided with panic type hardware (that is, a push bar for opening the door) on the inside of the door. A room heater shall be provided. Chlorine scale and storage rooms shall be equipped in the same manner.

5. Operation of the chlorinating devices shall be synchronized with the operation of the well pump.

(c) Regulations for disinfection by ultra-violet light are as follows:

1. Ultra-violet tubes shall be jacketed so that a temperature of 105 degrees Fahrenheit is maintained.

2. The jacket on the ultra-violet light tubes shall be quartz or high-silica glass with similar optical characteristics.

3. The ultra-violet light disinfection unit shall be designed to permit frequent mechanical cleaning of the water contact surface of the ultra-violet light tube jacket without disassembly of the unit.

4. The maximum water depth in the disinfection chamber, measured from the ultra-violet light tube surface to the outer walls of the chamber, shall not exceed three inches.

5. Ultra-violet radiation at a level of 2,537 Angstrom shall be applied at all points throughout the disinfection chamber at a minimum rate of 16,000 microwatt seconds per square centimeter.

6. An automatic flow control valve, accurate within the expected pressure range, shall be installed to restrict flow to the maximum design flow of the ultra-violet disinfection unit.

7. An accurately calibrated ultra-violet light intensity meter, filtered to confine its sensitivity to the range of disinfection spectrum, shall be installed in the wall of the disinfection chamber at the point of greatest water depth from the light transmitting source.

8. A flow diversion valve or automatic shut-off valve controlled by the ultra-violet light intensity meter shall be installed so as to permit water flow into the water system only when the minimum radiation level specified at (c)5 is applied. When power is not being supplied to the unit, the valve shall be in a closed (fail-safe) position to prevent the flow of water into the water system.

9. The ultra-violet light disinfection unit shall be installed in a manner such that it cannot be bypassed.

(d) Rules for disinfection by ozonation are as follows:

1. Ozonation may be used for disinfection of any public noncommunity or nonpublic water system.

2. Ozonation shall not be used as a substitute for postchlorination if the water system is required to maintain a chlorine residual in the distribution system pursuant to (a) 2 above.

3. Equipment used for ozonation shall be durable and corrosion resistant.

N.J. Admin. Code § 7:10-12.32