Newport Comprehensive Land Use Plan - Existing Conditions | Page 182

Newport Comprehensive Land Use Plan
As the total treatment capacity of the NWD’s water
treatment plants are expected meet the anticipated
demands in 2036, no alternative water sources or supply
enhancements have been investigated.

Since the population in Newport
is expected to continue declining,
the total treatment capacity of
the NWD’s water treatment
plants is able to meet anticipated
water demands in 2036.

In 2011, a 20-year forecast was completed to estimate the
yields of the NWD’s nine supply reservoirs. The water yield
of each of the nine reservoirs was estimated during average
conditions, a drought with a 20-year recurrence interval,
and with a drought that occurred from 1964 – 1966.
Table 13-4 shows the results of these estimations.
Table 13-4 - Estimated NWD Reservoir Yields (Measured in Million Gallons Daily)
Reservoir

Average Conditions

20-year Recurrence

1964 - 1966 Drought

Watson Reservoir

2.30

1.80

1.92

Nonquit Pond

4.67

2.77

3.02

St. Mary's Pond

0.62

0.47

0.34

Sisson Pond

0.55

0.44

0.32

Lawton Valley Reservoir

0.98

0.79

0.68

North & South Easton Ponds

3.20

2.50

1.78

Gardiner & Paradise Ponds

2.20

1.72

1.31

14.52

10.49

9.37

Total

Source: Newport Water Division Water Supply System Management Plan 2014

Currently, all of the water that NWD treats meets all drinking water standards. Though, the Rhode Island Department
of Environmental Management (RIDEM) has ranked all water supply reservoirs as “impaired”. This is due to either the
reservoirs being in poor habitat, or having high bacteria or excessive algae.
The following table, Table 13-5, shows the combined water quality analyses for the Station 1 and Lawton Valley –
WTPs from January 1st through December 31st, 2014. The table depicts every regulated contaminant that was
detected in the water, including the most minute.

Page 13-4

Draft Existing Conditions (March 2016)