Shoremont WTP			Brockport WTP			Purchased Water
Parameter				Lake Ontario			Lake Ontario			Hemlock Lake
	EPA/NYS MCL	EPA/NYS MCGL	UNITS	Average	Range	Samples in 1999	Average	Range	Samples in 1999	Average	Range	Samples in 1999
Inorganics, Metals, Physical Parameters
Aluminum	NS	NS	ug/L	63	60 -110	4	148	58-210	4	76	32-120	4
Antimony	6	6	ug/L	Not Detected		4	Not Detected		4	Not Detected		4
Arsenic	50	NS	ug/L	Not Detected		4	.06	ND-1.1	4	Not Detected		4
Barium	2	2	mg/L	0.021	.020 -.022	4	0.018	.003-.024	4	Not Detected		4
Beryllium	4	4	ug/L	Not Detected		4	Not Detected		4	Not Detected		4
Cadmium	5	5	ug/L	Not Detected		4	Not Detected		4	Not Detected		4
Calcium	NS	NS	mg/L	34	30-39	18	33	28-38	19	24	23-26	20
Chromium	100	100	ug/L	Not Detected		4	4	ND-6.4	4	3.1	ND-4.9	4
Copper  (Distribution System)	NS	NS	mg/L	Not Detected		4	0.0008	ND-.003	4	0.049	ND-.100	4
Copper (Customer Tap Samples)	AL*=1.3	0	mg/L	0.086	ND-1.3	128^(1997)	0.08	ND-.23	4	0.138	ND-.67	76*(1997)
Cyanide	200	0	ug/l	Not Detected		4	Not Detected		4	Not Detected		4
Fluoride	2.2	NA	mg/L	1.00	1.31	2049	0.99	.2-1.25	2183	0.86	.68-1.14	1075
Iron	300	NS	ug/L	Not Detected		4	Not Detected		4	Not Detected		4
Lead  (Distribution System)	NS	NS	ug/L	Not Detected	N-1.8	4	Not Detected		4	Not Detected		4
Lead (Customer Tap Samples)	AL*15	NS	ug/L	2	ND-13	128^(1997)	0.6	ND-4	8^(1997)	3	ND-18	76^(1997)
Magnesium	NS	NS	mg/L	8.6	8.4-8.7	4	9	8.5 -9.5	4	6.1	5.8-6.3	4
Manganese	300	NS	ug/L	Not Detected		4	Not Detected		4	2	ND-7.9	4
Mercury	2	2	ug/L	Not Detected		4	Not Detected		4	Not Detected		4
Nickel	100	NS	ug/L	Not Detected		4	Not Detected		4	Not Detected		4
Nitrate	10	10	mg/L	0.48	.29 -.48	4	0.36	.25 - .51	4	0.07	ND -.14	4
Nitrite	1	1	mg/L	Not Detected		4	Not Detected		4	Not Detected		4
Selenium	50	50	mg/L	Not Detected		4	Not Detected		4	Not Detected		4
Silver	100	NS	ug/L	Not Detected		4	Not Detected		4	Not Detected		4
Sodium	NS	NS	mg/L	11.6		1	11.1		1	15.2		1
Sulfate	250	NS	mg/L	29	28-30	4	26	25 - 27	4	18	16-20	4
Thallium	2	0.5	ug/L	Not Detected		4	Not Detected		3	Not Detected		4
Zinc	5	NS	mg/L	Not Detected		4	Not Detected		4	Not Detected		4
Alkalinity	NS	NS	mg/L	89	79 - 100	18	89	79 -98	17	64	61-69	20
Chlorides	250	NS	mg/L	23	23-25	4	25	22 -27	4	25	23-28	4
Color	15	NS	Color Units	Not Detected	ND -3	4	Not Detected		4	Not Detected	ND -3	4
Conductivity	NS	NS	umhos/cm	320	270 -370	18	320	260 -410	15	250	225 -273	800
pH	NS	NS	pH units	7.5	6.9-7.9	365	7.4	6.8 - 7.8	365	7.7	7.1- 8.3	365
Total Dissolved Solids	NS	NS	mg/L	170	150 -190	4	171	150 -190	4	145	130-160	4
Total Hardness	NS	NS	mg/L	124	119 -124	7	122	121 -123	2	88	85 -91	4
Total Organic Carbon	NS	NS	mg-L	1.7	1.4 -2.4	4	1.8	1.5 -2.4	4	1.7	1.7-1.8	3
Turbidity - Entry Point	TT**	NA	NTUs	0.11	.06-.35	2090	0.02	.001-.10	2181	0.10	.06-.30	8022
Turbidity - Distribution System	TT***	NA	NTUs	0.17	.07-7.2	1510	0.18	.07 -.7	96	0.2	.07-3	7976
Chlorine Residual - Entry Point	NS	NS	mg/L	1.12	.38 -2.0	8580	1.27	1.14-1.5	365	0.83	.32-1.7	8760
Chlorine Residual - Retail Dist.System	TT****	NA	mg/L	0.8	0-1.8	1538	0.61	.5-1.07	96	0.65	0-2.2	1433
Coliform - Retail Dist.System	TT*****	0	%Positive	0.8%	ND-0.7%	1538	0%		96	0.9%	ND-0.8%	1352
Cryptosporidium & Giardia	NS	NS	#/100L	Not Detected		6	Not Detected		12	Not Detected		4
Asbestos (Distribution System)	7	7	MFL	Not Detected		1^(1998)	Not Required		1	Not Detected		1^(1998)
Radionuclides
Gross Alpha	15	0	pC/L	Not Detected		4	Not Detected		4	Not Detected		1^(1997)
Gross Beta	50	0	pC/L	Not Detected		4	Not Detected		4	Not Detected		1^(1997)
Tritium	NS	NS	pC/L	Not Detected		4	Not Detected		4	NT
Volatile Organics
Benzene	5	0	ug/L	Not Detected   Not Detected Not Detected Not Detected Not Detected		4	Not Detected   Not Detected Not Detected Not Detected Not Detected		4	Not Detected   Not Detected Not Detected Not Detected Not Detected		4
Bromobenzene	5	0	ug/L			4			4			4
Bromochloromethane	5	0	ug/L			4			4			4
Bromomethane	5	0	ug/L			4			4			4
2-Butanone (MEK)	50	NS	ug/L			3			3			3
n-Butylbenzene	5	NS	ug/L			4			4			4
sec-Butylbenzene	5	NS	ug/L			4			4			4
tert-Butylbenzene	5	NS	ug/L			4			4			4
Carbon Tetrachloride	5	0	ug/L			4			4			4
Chlorobenzene	100	100	ug/L			4			4			4
Chloroethane	5	NS	ug/L			4			4			4
Chloromethane	5	NS	ug/L			4			4			4
2-Chlorotoluene	5	NS	ug/L			4			4			4
4-Chlorotoluene	5	NS	ug/L			4			4			4
dibromomethane	5	NS	ug/L			4			4			4
1,2-Dichlorobenzene	600	600	ug/L			4			4			4
1,3-Dichlorobenzene	5	NS	ug/L			4			4			4
1,4-Dichlorobenzene	75	75	ug/L			4			4			4
Dichlorodifluoromethane	5	NS	ug/L			4			4			4
1,1 Dichloroethane	5	NS	ug/L			4			4			4
1,2-Dichloroethane	5	0	ug/L			4			4			4
1,1-Dichloroethene	7	7	ug/L			4			4			4
cis-1,2-Dichloroethene	70	70	ug/L			4			4			4
trans-1,2-Dichloroethene	100	100	ug/L			4			4			4
1,2-Dichloropropane	5	0	ug/L			4			4			4
1,3-Dichloropropane	5	NS	ug/L			4			4			4
2,2-Dichloropropane	5	NS	ug/L			4			4			4
1,1-Dichloropropene	5	NS	ug/L			4			4			4
1,3-Dichloropropene(Cis)	5	NS	ug/L			4			4			4
1,3-Dichloropropene(Trans)	5	NS	ug/L			4			4			4
2,4-dinitrotoluene	50	NS	ug/L			4			4			4
Ethylbenzene	700	700	ug/L			4			4			4
Hexachlorobutadiene	5	NS	ug/L			4			4			4
Isopropylbenzene	5	NS	ug/L			4			4			4
p-Isopropyltoluene	5	NS	ug/L			4			4			4
4-Methyl-2-Pentanone(MIBK)	50	NS	ug/L			3			3			3
Methyl Tert-butyl ether (MTBE)	5	NA	ug/L			4			3			4
Methylene Chloride (Dichloromethane)	5	0	ug/L			3			3			4
Naphthalene	5	NS	ug/L			4			4			4
n-Propylbenzene	5	NS	ug/L			4			4			4
Styrene	100	100	ug/L			4			4			4
1,1,1,2-Tetrachloroethane	5	NS	ug/L			4			4			4
1,1,2,2-Tetrachloroethane	5	NS	ug/L			4			4			4
Tetrachloroethene	5	NS	ug/L			4			4			4
Toluene	1000	1000	ug/L			4			4			4
1,2,3-Trichlorobenzene	5	NS	ug/L			4			4			4
1,2,4-Trichlorobenzene	70	70	ug/L			4			4			4
1,1,1-Trichloroethane	200	200	ug/L			4			4			4
1,1,2-Trichloroethane	5	0	ug/L			4			4			4
Trichloroethene	5	NS	ug/L			4			4			4
Trichlorofluoromethane	5	NS	ug/L			4			4			4
1,2,3-Trichloropropane	5	NS	ug/L			4			4			4
1,2,4-Trimethylbenzene	5	NS	ug/L			4			4			4
1,3,5-Trimethylbenzene	5	NS	ug/L			4			4			4
Xylenes	5	NS	ug/L			4			4			4
Vinyl chloride	2	0	ug/L			4			4			4
Organics, Pesticides, Herbicides
Bis(2-Ethylhexyl)phthalate	6	0	ug/L	0.71		1	Not Detected		1	Not Detected		1
Dacthal(DCPA)	50	NS	ug/L	0.1		1	Not Detected		1	Not Detected		1
Di-n-butylphalate	50	NS	ug/L	Not Detected		1	0.58		1	Not Detected		1
1, 2-Dibromo-3-Chloropropane	200	0	ng/L	Not Detected Not Detected Not Detected   Not Detected Not Detected Not Detected			Not Detected Not Detected Not Detected   Not Detected Not Detected Not Detected		2	Not Detected Not Detected Not Detected   Not Detected Not Detected Not Detected		2
1, 2-Dibromoethane (EDB)	50	0	ng/L			2			2			2
2, 4, 5-TP (Silvex)	10	NA	ug/L			3			3			3
2, 4-D	50	NA	ug/L			3			3			3
3-Hydroxycarbofuran	50	NS	ug/L			1			1			1
Acenaphthylene	50	NS	ug-L			1			1			1
Alachlor	2	0	ug/L			3			3			3
Aldicarb	3	1	ug/L			1			1			1
Aldicarb Sulfone	2	1	ug/L			1			1			1
Aldicarb Sulfoxide	4	1	ug/L			1			1			1
Aldrin	50	NS	mg/L			4			4			4
Alpha-BHC (Alpha Lindane)	5	NS	ug/L			3			3			3
Anthracene	50	NS	ug/L			1			1			1
Atrazine	3	3	ug/L			3			3			3
Benzo(a)pyrene	200	0	ng/L			1			1			1
Benz(a)Anthracene	50	NS	ug/L			1			1			1
Benzo(b)Flouranthene	50	NS	ug/L			1			1			1
Benzo(g,h,i) Perylene	50	NS	ug/L			1			1			1
Benzo(k)Fluoranthene	50	NS	ug/L			1			1			1
Beta-BHC	5	NS	ug/L			3			3			3
Bromacil	50	NS	ug/L			1			1			1
Butachlor	50	NS	ug/L			1			1			1
Butybenzylphthalate	50	NS	ug/L			1			1			1
Carbaryl	50	NS	ug/L			1			1			1
Carbofuran	40	40	ug/L			1			1			1
Chrysene	50	NS	ug/L			1			1			1
Dalapon	200	200	ug/L			3			3			3
Di(2-Ethylhexyl) Adipate	400	400	ug/L			1			1			1
Dibenz(a,h)Anthracene	50	NS	ug/L			1			1			1
Dicamba	50	NS	ug/L			3			3			3
Dieldrin	50	NS	ug/L			4			4			4
Diethylphalate	50	NS	ug/L			1			1			1
Dimethoate	50	NS	ug/L			1			1			1
Dimethylphthalate	50	NS	ug/L			1			1			1
Dinoseb	7	7	ug/L			4			4			4
Dioxin	30	0	pg/L			1			1			1
Diquat	20	20	ug/L			1			1			1
Endosulfan l (alpha)	50	NS	ug/L			1			1			1
Endosulfan ll (beta)	50	NS	ug/L			1			1			1
Endosulfan Sulfate	50	NS	ug/L			1			1			1
Endothall	100	100	ug/L			1			1			1
Endrin	2	2	ug/L			4			4			4
Glyphosate	700	700	ug/L			1			1			1
Heptachlor	400	0	ng/L			4			4			4
Heptachlor Epoxide	200	0	ng/L			4			4			4
Hexachlorobenzene	1	0	ug/L			3			3			3
Hexachlorocyclopentadiene	50	50	ug/L			1			1			1
Indeno(1,2,3,c,d)Pyrene	50	NS	ug/L			1			1			1
Isophorone	50	NS	ug/L			1			1			1
Methomyl	50	NS	ug/L			1			1			1
Methoxychlor	40	40	ug/L			4			4			4
Metolachlor	50	NS	ug/L			3			3			3
Metribuzin	50	NS	ug/L			3			3			3
Molinate	50	NS	ug/L			1			1			1
Oxamyl	200	200	ug/L			1			1			1
Paraquat	50	NS	ng/L			4			4			4
PCB's Total	500	0	ng/L			4			4			4
Pentachlorophenol	1	0	ug/L			3			3			3
Phenanthrene	50	NS	ug/L			1			1			1
p,p' DDD	5	NS	ug/L			1			1			1
p,p' DDT	5	NS	ug/L			1			1			1
Propachlor	50	NS	ug/L			3			3			3
Pyrene	50	NS	ug/L			1			1			1
Simazine	4	4	ug/L			3			3			3
Total Chlordane	2	0	ug/L	4	4	4
Toxaphene	3	0	ug/L	4	4	4
4,4'-DDT	NS	NS	mg/L	2	2	2
Mirex	NS	NS	mg/L	3	3	3
Perchlorate	NS	NS	ug/L	1	NR			NR
Disinfectant Byproducts
Total THMs	100	NS	ug/L	35	20-50	21	30	20-44	16	40	28-56	4
Halkoacetic Acids	80	NS	ug/L	11	5.2-18	15	14	4-22	16	21	16-29	3
Haloacetilenitriles	NS	NS	ug/L	4.4	3.4-5.5	16^(1998)	Not Required			3.9	1.5-5.3	16^(1998)
Haloketones	NS	NS	ug/L	1.8	0.9-3.4	16^(1998)	Not Required			4.5	1.2-7.6	16^(1998)
Chloropicrin	NS	NS	ug/L	Not Detected		16^(1998)	Not Required			0.5	ND-0.8	16^(1998)
Chloral Hydrate	NS	NS	ug/L	4.6	1.6-12	16^(1998)	Not Required			8.5	1.6-13	16^(1998)
Total Organic Halides	NS	NS	ug/L	101	54-158	16^(1998)	Not Required			245	110-350	16^(1998)

MCL = Maximum Contaminant Level, the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as possible.
MCLG = Maximum Contaminant Level Goal, the level of a contaminant below which there is no known or expected risk to health. MCLGs allow for a margin of safety.
TT = Treatment Technique, a required process intended to reduce the level of a contaminant in drinking water.
AL = Action Level, the concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.
Not Detected = ND = absent or present at less than testing method detection level. All testing methods are EPA approved with detection limits much less than the MCL.
NA = Not applicable
NR = Not required
NS = No standard
NT = Not Tested
mg/l = milligram (1/1,000 of a gram) per liter = ppm = parts per million
ug/l = microgram (1/1,000,000 of a gram) per liter = ppb = parts per billion
ng/L = nanogram (1/1,000,000,000 of a gram) per liter = ppt = parts per trillion
pg/L = picogram (1/1,000,000,000,000 of a gram) per liter = ppq = parts per quadrillion
pC/L = picoCuries per liter
NTU = Nephelometric turbidity Unit, a measure of the clarity of water.
MF/L = million fibers per liter, a measure of the presence of asbestos fibers longer than 10 micrometers
^(year) = Most recent testing. Monitoring frequency requirements vary depending on compound.
*Action level: If >10% of results are greater than 15 ug/l for lead or 1.3 mg/L for copper, remediative steps are required. In MCWA's combined retail area, 90% of the samples were less than 5 ug/Lfor lead and 0.122 mg/L for copper.
** = 95% of measurements within a given month must be less than <.5 NTUs.
*** = Average of monthly distribution system turbidity samples must be less than 5.0 NTUs.
**** = 95% of monthly distribution system samples must have a measurable chlorine residual.
***** = 95% of monthly distribution system samples must be coliform negative.
Note: Total Hardness is also expressed in grains per gallon. The Total Hardness of the Ontario and Hemlock supplies are 7.6 and 5.6 grains per gallon respectively.