(1) Furnish potable water that is of a safe
and satisfactory quality for all domestic use and that is in compliance with
federal and state requirements for drinking water.
(2) Ensure that each service connection shall
have a curb stop or other means of isolating the service connection and that
each customer can be disconnected without affecting another customer.
(3) Maintain a minimum static pressure
delivered to the curb stop during normal operating conditions of thirty-five
pounds per square inch.
(4) Not
allow pressure to exceed one hundred twenty-five pounds per square inch at the
curb stop.
(5) Minimize water loss
in the water system distribution system by operating a water loss control
program meeting the minimum criteria outlined herein.
(a) For water systems that have less than
three thousand total active and inactive service connections, the water company
shall:
(i) Calculate and determine water loss
volume in gallons per service connection per day per system average operating
pressure (gals/connection/day/psi) based on a rolling twelve month average in
each of its system(s) and report on the quarterly report.
(ii) Establish a target water loss volume
(TWLV) in gallons per service connection per day per system operating pressure
(gals/connection/day/psi) for each of its system(s) based on a minimum of
twelve months of data. The TWLV shall be reviewed and approved by staff
annually.
(iii) Determine the
percentage of water loss from the water system based on a rolling twelve month
average in each of its system(s) and report on the quarterly report.
The water company should also provide appropriate water
loss information to commission staff upon request.
(b) The percentage of water loss is the water
loss volume divided by the total system delivery volume.
The water loss volume is the total system delivery volume minus
metered consumption volume minus non-metered water loss volume. Where:
(i) Total system delivery volume (in gallons)
of water delivered into the water distribution in gallons.
(ii) Metered consumption volume (in gallons)
including both revenue and non-revenue water as measured by a metering
device
(iii) Non-metered water loss
volume (in gallons) includes water usage for firefighting purposes, flushing,
tank draining, street cleaning, sewer flushing, plant usage, and water loss
from surfacing water leaks repaired within five days of becoming aware of the
water leak.
(c) When the
water loss percentage is greater than fifteen per cent, the water company
shall:
(i) Determine the economic level
leakage and develop a water loss remedial program based on the economic level
leakage to achieve a water loss equal to or less than fifteen per cent or shall
justify for staff's approval a more economically realistic goal based on a
cost/benefit analysis.
(ii)
Determine the economic level leakage and develop a water loss remedial program
based on the economic level leakage to achieve a specific water loss volume per
connection per day per psi for staff's review and approval.
(d) For water systems with more
than three thousand total service connections or a service connection of more
than sixteen service connections per mile of distribution main, the water
company shall:
(i) Calculate the
infrastructure leakage index (ILI) annually using the American water works
association's "M36 Water Audits and Loss Control Programs" (fourth edition,
2016) software. Non-revenue water is the preferred
metric for this calculation.
(ii) Utilize preliminary target ILI's
established by commission staff for each system based on criteria set forth in
the American water works association's "M36 Water Audits and Loss Control
Programs" (fourth edition, 2016). The preliminary target ILI may be adjusted
based on the calculated economic level of leakage when a system's annual ILI
exceeds or is equal to the preliminary target ILI.
(iii) Determine the economic level of leakage
and develop a water loss remedial program based on the economic level of
leakage.
(iv) Not be required to
calculate the economic level of leakage when the calculated annual ILI for a
system is equal to or less than 3.0.
(e) Water systems shall only be required to
decrease system water loss to the economic level of leakage.
(f) Submit an annual water loss control
program report documenting the requirements above to the commission with
supporting documents by March thirty-first of the year following the reporting
year.
