Water Supply System Information
This document is prepared by the Roslyn Water District (PWS ID NO. 2902851) as prescribed by Part 5-1.72 of the New York State Sanitary Code (10NYCRR) and by the Federal Consumer Confidence Report Regulation (40 CFR part 141, subpart U). This report contains important information about your drinking water. Included are details about where your water comes from, what it contains, and how it compares to State standards. We are proud to report that during 2006 our system did not violate a maximum contaminant level or any other water quality standard.
The Roslyn Water District is a municipal corporation having its offices at 24 West Shore Road, Roslyn, N.Y. 11576. The District has 5,840 service connections and supplies drinking water to a population estimated at 17,000 people. It is managed by a Board of Commissioners consisting of three commissioners each elected to a separate three year term. The person in charge of operating the water supply system is the Superintendent of the District, Richard J. Passariello, who can be reached by telephone at (516) 621-7770 to answer questions about this report.
The Board of Commissioners have regular scheduled meetings open to the public held at the District office on the first, second, third and fifth Thursdays of the month at 9:00 A.M. Consumers within the Roslyn Water District are given the opportunity to participate in decisions affecting drinking water quality at these public meetings.
Nassau County Department of Health has jurisdiction over the water system of the District. The Department of Health is located at 240 Old Country Road, Mineola, N.Y. 11501-4250 and representatives can be reached by telephone at (516) 571-3323.

Water Supply Sources and Treatment
Our source of drinking water is groundwater drawn from seven individual wells drilled into the Magothy aquifer at depths ranging from 431 feet to 530 feet and from one well field containing eight wells connected to a common suction pump. The seven individual wells are located throughout the District and on separate sites consisting of approximately one acre each. Two wells are in the Inc. Village of Roslyn Estates and five are located in the Inc. Village of East Hills.
Water is pumped directly from these wells into our distribution system at a rate for each well of between 1,000 and 1,200 gallons per minute. The distribution system includes three (3) storage tanks ranging in size from 1 million gallons in capacity to 3 million gallons with a total storage capacity of 6 million gallons.
Eight common suction wells ranging in depths from 260 feet to 555 feet are located on a well field in the Inc. Village of Roslyn. These wells consist of flowing artesian wells, seven of which are in the Magothy aquifer and one in the Lloyd aquifer. All eight wells are connected to a single turbine pump, which delivers the water directly into the distribution system at a rate of 1,100 gallon per minute.
Water is treated at each well site before entering distribution as follows: sodium hydroxide to adjust the naturally occurring acidity in groundwater this helps prevent corrosion; sodium hypochlorite or calcium hypochlorite is added as a precaution for disinfection.
One well located in the Inc. Village of Roslyn Estates, in addition to treatment for pH adjustment and disinfection, is treated by granular activated carbon for adsorption of organic contaminants 1,2-Dibromoethane (EDB), 1,1-Dichloroethane, Tetrachloroethene, Trichloroethene and 1,1,1-Trichloroethane. These contaminants are generally removed to below the detection level before the water enters the distribution system.

Source Water Assessment
The New York State Department of Health, with assistance from the local health department and the CDM consulting firm, has completed a source water assessment for this system, based on available information. Possible and actual threats to this drinking water source were evaluated. The source water assessment includes a susceptibility rating based on the risk posed by each potential source of contamination and how rapidly contaminants can move through the subsurface to the wells. The susceptibility of a water supply well to contamination is dependent upon both the presence of potential sources of contamination within the well’s contributing area and the likelihood that the contaminant can travel through the environment to reach the well. The susceptibility rating is an estimate of the potential for contamination of the source water, it does not mean that the water delivered to consumers is, or will become contaminated. See section “What Did We Find In Your Drinking Water” for a list of the contaminants that have been detected (if any). The source water assessments provide resource managers with additional information for protecting source waters into the future.
Drinking water is derived from 8 wells. The source water assessment has rated some of the wells as having a very high susceptibility to industrial solvents and most of the wells as having a high to very high susceptibility to nitrates. The elevated susceptibility to industrial solvents is due primarily to point sources of contamination related to commercial/industrial facilities and related activities in the assessment area. The elevated susceptibility to nitrates is due to unsewered residential land use and related practices, such as fertilizing lawns, in the assessment area.
A copy of the assessment, including a map of the assessment area, can be obtained by contacting us, as noted below.

What Did We Find In Your Drinking Water?
In accordance with State and County regulations, we routinely monitor your drinking water for numerous contaminants. We test your drinking water for coliform bacteria, physical and inorganic constituents like lead, copper and nitrate; principal organic contaminants, total trihalomethanes, radiological, and specific organic contaminants/ pesticides. The following table depicts only those contaminants, which were detected in your drinking water during 2006.
It should be noted that any drinking water, including bottled drinking water, may be reasonably expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the Environmental Protection Agency’s (EPA’s) Safe Drinking Water Hotline (800-426-4791) or the Nassau County Health Department at 516-571-3323.

What Does This Information Mean?
A review of the table indicates that our system has no violations. We have learned through our testing that some contaminants were detected; however, these contaminants were detected below the level prescribed by the State.
Although nitrate was detected below the MCL, it was detected at 6.98 mg/l which is greater than one-half of the MCL of 10 mg/l. Therefore, we are required to present the following information on nitrate in drinking water:
“Nitrate in drinking water at levels above 10 mg/l is a health risk for infants of less than six months of age. High nitrate levels in drinking water can cause blue baby syndrome. Nitrate levels may rise quickly for short periods of time because of rainfall or agricultural activity. If you are caring for an infant, you should ask for advice from your health care provider.”
The table also indicates that none of the samples analyzed for lead and copper monitoring exceeded the action levels. Infants and young children are typically more vulnerable to lead in drinking water than the general population. It is possible that lead levels at your home may be higher than at other homes in the community as a result of materials used on your home’s plumbing. If you are concerned about elevated lead levels in your home’s water, you may wish to have your water tested and as a precaution flush your tap 30 seconds to 2 minutes before using tap water. Additional information is available from EPA’s Safe Drinking Water Hotline (1-800-426-4791).

NOTES: If iron and manganese are present, the total concentration of both should not exceed 500 ug/l. Water containing more than 20 mg/l of sodium should not be used for drinking by people on severely restricted sodium diets. Water containing more than 270 mg/l of sodium should not be used for drinking by people on moderately restricted sodium diets. During 2005, 30 point of use samples were collected and analyzed for lead. The level included in the table represents the 90th percentile of the sites tested. The action level for lead was not exceeded at any of the sites tested. During 2005, 30 point of use samples were collected and analyzed for copper. The level included in the table represents the 90th percentile of the sites tested. The action level for copper was not exceeded at any of the sites tested. An MCL has not been established for this contaminant. The value represents a State Guidance Level. The State considers 50 pCi/l to be the level of concern for beta particles. DEFINITIONS: Maximum Contaminant Level (MCL) - The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible. Maximum Contaminant Level Goal (MCLG) - The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety. Action Level (AL) - The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow. Treatment Technique (TT) - A required process intended to reduce the level of a contaminant in drinking water. Milligrams per liter (mg/l) - Corresponds to one part of a substance in one million parts of liquid (parts per million - ppm). Micrograms per liter (ug/l) - Corresponds to one part of a substance in one billion parts of liquid (parts per billion - ppb). N/A - This stands for not applicable. No MCLG has been established for this contaminant. < -This symbol indicates the level is less than the number shown. Picocuries per liter (pCi/l) - Picocuries per liter is a measure of the radioactivity in water.

Description of Water Used
During 2006, a total of 1,263,460,000 gallons of water was pumped from the District’s Wells. Of that total, 59,713,000 gallons were supplied under contract to the Glenwood Water District and 8,725,000 gallons were supplied under contract to the Albertson Water District. Total of metered sales account for 1,168,985,000 gallons. This leaves an unaccounted for total of 94,475,000 gallons.This is the amount of water used during the year for flushing hydrants, fire fighting, main breaks and service line leaks. It represents 7.5% of the total water produced.

Water Source Restrictions
Our water service to customers in 2006 continued without permanent interruption or restriction due to contamination of water quality. The yield from our Well No. 4 (N4623) has been reduced from 1,200 gallons per minutes to 1,000 gallons per minute to limit the submergence on the pump due to a lowering of the water table level in that area.The pump has been lowered to maintain a safe amount of submergence.No further action other than monitoring the situation is anticipated at this time. The reduced yield does not pose a capacity problem in meeting system demand.

Water Conservation Measures
The Roslyn Water District has implemented a water conservation program, portions of which are contained in the Ordinances of the District including regulations of lawn irrigation systems, which require all systems to have time clock controllers and a rain or soil moisture sensor. Sprinkling of lawns and gardens can only be performed between the hours of 4:00 p.m. and 10:00 a.m. for a maximum of a 3-hour duration on alternate days; on odd days for odd numbered premises and even days for even numbered premises, and even days for premises with no numbers. Consumers are required by law to comply with these regulations. Consumers can reduce water by promptly repairing leaks as soon as they are disclosed. A leak of one drop per second wastes 2,400 gallons per year. Consumers can also reduce water use by installing aerators on faucets, displacement devices in toilet tanks and automatic shut-off nozzles on garden hoses. During remodeling, if old plumbing fixtures are replaced, the law requires that new fixtures must be of the approved water saving type. Each customer should reduce overall water use by at least ten (10) percent.

Facility Modifications
We constantly work at improving and upgrading our facilities. During the past year, we have implemented a radio meter reading system. The Administration Office has been renovated. Granular activated carbon was replaced in the adsorbers at the Well No. 8 treatment facility with new virgin granular activated carbon. There have been numerous security upgrades at our facilities and various distribution system improvements.

Annual Average Charge for Water
Our water rate structure is designed to promote conservation; the more you use, the more you pay. The average consumer pays a minimum quarterly charge of $9.00 for 12,000 gallons. Our water rate is $0.75 per 1,000 gallons for the first 21,000 gallons consumed; $0.95 per 1,000 gallons for the next 21,000 gallons; $1.30 for the next 66,000 gallons and $1.80 per 1,000 gallons for quarterly use over 108,000 gallons. The average annual cost for metered water for a residential user in 2006 was $184.85 or 51 cents per day.
See page 7 for new 2007 rate structure.

Educational Information
Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the EPA’s Safe Drinking Water Hotline (1-800-426-4791).
Some people may be more vulnerable to disease causing microorganisms or pathogens in drinking water than the general population. Immuno-compromised persons such as persons with cancer undergoing chemotherapy, persons who have undergone organ transplants, people with HIV/AIDS or other immune system disorders, some elderly and infants can be particularly at risk from infections. These people should seek advice from their health care provider about their drinking water. EPA/CDC guidelines on appropriate means to lessen the risk of infection by Cryptosporidium, Giardia and other microbial pathogens are available from the Safe Drinking Water Hotline (800-426-4791).
The sources of drinking water (both tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs, and wells. As water travels over the surface of the land or through the ground, it dissolves naturally-occurring minerals, and, in some cases radioactive material, and can pick up substances resulting from the presence of animals or from human activities. Contaminants that may be present in source water include: microbial contaminants; inorganic contaminants; pesticides and herbicides; organic chemical contaminants; and radioactive contaminants. In order to ensure that tap water is safe to drink, the State and the EPA prescribe regulations which limit the amount of certain contaminants in water provided by public water systems. The State Health Department’s and the Food and Drug Administration’s (FDA’s) regulations establish limits for contaminants in bottled water which must provide the same protection for public health.

Annual Water Quality Report Supplement
A supplement to this Water Quality Report has been prepared which contains the analytical results of water quality monitoring from the individual wells in the District. This report is available at the District office.
Thank you for allowing us to continue to provide your family with quality drinking water this year. We ask that all our consumers help us protect our water sources which are the heart of our community and our way of life. Please call our office if you have questions.