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Table 20: Water to Watch: Hundreds of water systems have water supplies contaminated with nitrate at concentrations approaching

February 1, 1996

Pouring It On: Table 20: Water to Watch: Hundreds of water systems have water supplies contaminated with nitrate at concentrations approaching

Rank System City State Population Served Highest Sample Date of Highest Sample Number of Samples Taken % over Int'l Standard
1 Waterloo Water Works Waterloo IA 66,467 9.9 8/10/94 113 25.7%
2 East Hempfield Water Authority Landisville PA 13,493 9.9 9/15/93 73 58.9%
3 Harford County Dpw Bel Air MD 63,000 9.9 7/26/93 20 10.0%
4 Westminster Westminster MD 22,766 9.9 2/18/93 18 77.8%
5 City Of Wasco Wasco CA 13,774 9.8 2/14/95 7 42.9%
6 Northern Il Wtr Corp-Pontiac Pontiac IL 11,200 9.8 3/26/95 63 50.8%
7 City Of Lancaster Authority Lancaster PA 108,000 9.8 2/8/94 18 38.9%
8 Cal. Water Service Co.-East L.A. San Jose CA 152,970 9.8 7/13/93 21 23.8%
9 Morro Bay City Water Dept Morro Bay CA 15,000 9.8 7/5/95 25 28.0%
10 City Of Manteca Manteca CA 44,500 9.8 3/5/93 24 41.7%
11 City Of Chino Hills Chino Hills CA 49,000 9.8 11/10/93 17 35.3%
12 Chippewa Falls Waterworks Chippewa Falls WI 12,989 9.7 8/30/93 1 100.0%
13 Hillcrest Wc - 1,2,3 & 4 Yuba City CA 10,062 9.6 7/25/95 6 33.3%
14 City Of Fresno Fresno CA 390,350 9.6 8/31/94 312 17.6%
15 Garden City, City Of Garden City KS 24,097 9.5 5/9/94 27 22.2%
16 Ottumwa Water Works Ottumwa IA 24,488 9.5 5/1/95 14 50.0%
17 Lca-Wlsa Central Division Wescosville PA 17,285 9.4 6/21/94 244 95.9%
18 Bucks Co Water And Sewer Auth Warrington PA 16,200 9.4 12/26/93 3 33.3%
19 La Crosse Waterworks La Crosse WI 51,000 9.4 12/15/93 1 100.0%
20 Decatur Decatur IL 83,885 9.4 6/6/95 134 43.3%
21 Cuc - Suburban Sacramento CA 32,000 9.3 2/16/95 69 14.5%
22 City Of Davis Davis CA 48,250 9.3 7/26/95 116 13.8%
23 City Of Bakersfield Bakersfield CA 57,740 9.3 10/3/94 62 8.1%
24 West San Bernardino Cwd Rialto CA 41,454 9.3 3/6/95 34 50.0%
25 Bloomington Bloomington IL 52,000 9.3 5/30/95 63 41.3%
26 City Of Downey Downey CA 91,000 9.2 2/17/93 53 3.8%
27 Northampton Bucks Co. Mun Auth Richboro PA 30,000 9.2 9/8/94 40 2.5%
28 Metropolitan Water Co Tucson AZ 36,250 9.2 12/23/93 109 6.4%
29 City Of Rialto Rialto CA 48,418 9.1 12/7/93 131 27.5%
30 Oxnard Wd Oxnard CA 146,571 9.1 6/22/95 23 17.4%
31 Del Este Modesto CA 11,851 9.1 5/12/93 8 37.5%
32 Chester Water Authority Chester PA 110,000 9.1 1/21/94 11 45.5%
33 City Of Anaheim Anaheim CA 286,680 9.0 8/9/95 136 22.8%
34 University of Pennsylvania University Park PA 37,000 8.9 7/13/94 45 37.8%
35 Il American Wtr Cmpny-Pekin Pekin IL 39,000 8.9 7/19/94 34 11.8%
36 San Jose Water Company San Jose CA 921,000 8.9 5/17/93 264 11.4%
37 City Of Ceres Ceres CA 28,988 8.9 2/2/95 8 50.0%
38 City Of Delano Delano CA 29,944 8.9 8/10/93 47 53.2%
39 Us Army Fort Irwin Fort Irwin CA 16,000 8.8 2/14/95 42 26.2%
40 Security W&SD Colorado Springs CO 10,007 8.8 4/3/95 80 93.8%

Source: State drinking water agency nitrate monitoring database. Compiled by Environmental Working Group.