Distribution Class D1

to reliably deliver an adequate supply of safe, aesthetically pleasing supply of water to consumers' taps

- produce safe water according to state standards
- accurately document and report results
- first line of defense

1. risk of compromising water quality leading to adverse health
2. risk of damage to treatment facilities, mains, tanks, etc.
3. loss of public confidence
4. disciplinary actions

any publicly or privately owned system that provides piped water for human consumption and has 15 service connections OR regularly serves an average of at least 25 individuals daily for at least 60 days per year

1. Transient
2. Non-Transient

1. Surface Water: rivers, lakes, reservoirs
2. Ground Water: wells, springs

1. recharged by runoff from the watershed and direct precipitation
2. more susceptible to contamination from runoff than groundwater
3. Require treatment including filtration
4. subject to seasonal variation
5. NE surface water can typically be "soft" and can be corrosive if not treated properly, depending on location

1. reservoir turnover due to temperature stratification
2. algal blooms
3. increased sodium from road salt

- agricultural runoff
- acid rain
- chemical spills
- septic tanks
- emerging contaminants
- road salt
- nature (beavers, wildlife changes, etc.)
- terrorism

1. different types of aquifers
2. Susceptible to different types of contamination
3. Less temperature variation
4. Contains minerals, may require "softening" as it is hard water