The Power of Information

National Drinking Water Database


LA Puente Valley Cwd Utilities - Los Angeles, CA


Serves 7,500 people

Perchlorate

Perchlorate is a synthetic oxygen additive in solid fuel propellant for rockets, missiles, and fireworks, and is primarily used by the military and the space industry; it may occur naturally in certain imported agricultural fertilizers.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
268 days
Test Days Exceeding Legal LimitsNumber of days in which the samples taken in that day exceed the Maximum Contaminant Level (Depending on the contaminant and its MCL, that may or may not trigger an MCL violation. Some MCLs are based on averages spanning several months to a year)
0 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
283 days
Tests ConductedNumber of individual tests done for this contaminant
549 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
PerchloratePerchlorate is a synthetic oxygen additive in solid fuel propellant for rockets, missiles, and fireworks, and is primarily used by the military and the space industry; it may occur naturally in certain imported agricultural fertilizers.20.96 ppb
68 ppb
Yes
5 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
NOTE: Each dot in the above graph represents one month.
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

Health Based and Legal Limits for Perchlorate

Health Based Limits for Perchlorate

StandardDescriptionLevel
Health-Based Screening LevelA benchmark concentration of contaminants in water that may be of potential concern for human health, if exceeded. For noncarcinogens, the HBSL represents the contaminant concentration in drinking water that is not expected to cause any adverse effects over a lifetime of exposure. For carcinogens, the HBSL range represents the contaminant concentration in drinking water that corresponds to an excess estimated lifetime cancer risk of 1 chance in 1 million to 1 chance in 10 thousand. Source: U.S. Geological Survey.5 ppb
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.6 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-03-3015.5 ppb210 to 31 ppb
2009-03-2315 ppb210 to 30 ppb
2009-03-1617 ppb210 to 34 ppb
2009-03-1015 ppb210 to 30 ppb
2009-03-0968 ppb1068 ppb
2009-03-0315.33 ppb310 to 32 ppb
2009-02-2319 ppb210 to 38 ppb
2009-02-1717.33 ppb302 to 37 ppb
2009-02-0919.1 ppb202.2 to 36 ppb
2009-02-0219.67 ppb310 to 44 ppb
2009-01-2620.5 ppb210 to 41 ppb
2009-01-2019 ppb310 to 42 ppb
2009-01-1239.67 ppb302 to 69 ppb
2009-01-0512.2 ppb202.4 to 22 ppb
2008-12-3027.55 ppb202.1 to 53 ppb
2008-12-2311 ppb210 to 22 ppb
2008-12-1631.5 ppb210 to 63 ppb
2008-12-0811.5 ppb210 to 23 ppb
2008-12-0130.25 ppb202.5 to 58 ppb
2008-11-2412.7 ppb202.4 to 23 ppb
2008-11-1731.45 ppb202.9 to 60 ppb
2008-11-1012.65 ppb202.3 to 23 ppb
2008-11-0328.6 ppb202.2 to 55 ppb
2008-10-2711 ppb210 to 22 ppb
2008-10-2031.5 ppb210 to 63 ppb
2008-10-1311 ppb210 to 22 ppb
2008-10-0628.75 ppb202.5 to 55 ppb
2008-09-3013.35 ppb202.7 to 24 ppb
2008-09-2231 ppb202 to 60 ppb
2008-09-1510 ppb210 to 20 ppb
2008-09-0828.35 ppb202.7 to 54 ppb
2008-09-0210 ppb210 to 20 ppb
2008-08-2530.3 ppb202.6 to 58 ppb
2008-08-1810.5 ppb210 to 21 ppb
2008-08-1126.5 ppb210 to 53 ppb
2008-08-0412.6 ppb202.2 to 23 ppb
2008-06-2312.5 ppb210 to 25 ppb
2008-06-170 ppb110 ppb
2008-06-0912 ppb210 to 24 ppb
2008-06-0211 ppb210 to 22 ppb
2008-05-1228 ppb210 to 56 ppb
2008-05-0510.5 ppb210 to 21 ppb
2008-04-2828 ppb210 to 56 ppb
2008-04-2111 ppb210 to 22 ppb
2008-04-1429.05 ppb202.1 to 56 ppb
2008-04-0712.6 ppb202.2 to 23 ppb
2008-03-3129.7 ppb202.4 to 57 ppb
2008-03-2412.55 ppb202.1 to 23 ppb
2008-03-1729.1 ppb202.2 to 56 ppb
2008-03-1012.6 ppb202.2 to 23 ppb
2008-03-0330.6 ppb202.2 to 59 ppb
2008-02-2713.15 ppb202.3 to 24 ppb
2008-02-1931.15 ppb202.3 to 60 ppb
2008-02-1113.75 ppb202.5 to 25 ppb
2008-02-0432.15 ppb202.3 to 62 ppb
2008-01-3013.6 ppb202.2 to 25 ppb
2008-01-2232.1 ppb202.2 to 62 ppb
2008-01-1413.15 ppb202.3 to 24 ppb
2008-01-0212.5 ppb210 to 25 ppb
2007-12-2628 ppb210 to 56 ppb
2007-12-1711.5 ppb210 to 23 ppb
2007-12-1030.65 ppb202.3 to 59 ppb
2007-12-0313.85 ppb202.7 to 25 ppb
2007-11-2630.35 ppb202.7 to 58 ppb
2007-11-2013.15 ppb202.3 to 24 ppb
2007-11-1428.7 ppb202.4 to 55 ppb
2007-11-0814.3 ppb202.6 to 26 ppb
2007-10-3031.2 ppb202.4 to 60 ppb
2007-10-2315.4 ppb202.8 to 28 ppb
2007-10-0813.05 ppb202.1 to 24 ppb
2007-10-0229.6 ppb202.2 to 57 ppb
2007-09-1713.75 ppb202.5 to 25 ppb
2007-09-1112 ppb210 to 24 ppb
2007-09-0429.05 ppb202.1 to 56 ppb
2007-08-2813.3 ppb202.6 to 24 ppb
2007-08-2030.75 ppb202.5 to 59 ppb
2007-08-1413.5 ppb202 to 25 ppb
2007-08-0727.5 ppb210 to 55 ppb
2007-07-3112.8 ppb210 to 25.6 ppb
2007-07-2427.5 ppb210 to 55 ppb
2007-07-1711.5 ppb210 to 23 ppb
2007-07-1027 ppb210 to 54 ppb
2007-07-0311.5 ppb210 to 23 ppb
2007-06-2627.5 ppb210 to 55 ppb
2007-06-1911.5 ppb210 to 23 ppb
2007-06-1427.5 ppb210 to 55 ppb
2007-06-0634.67 ppb310 to 52 ppb
2007-05-315.2 ppb210 to 10.4 ppb
2007-05-2227.5 ppb210 to 55 ppb
2007-05-1712 ppb210 to 24 ppb
2007-05-0831 ppb210 to 62 ppb
2007-05-0111 ppb210 to 22 ppb
2007-04-2528 ppb210 to 56 ppb
2007-04-1712.9 ppb202.8 to 23 ppb
2007-04-1027 ppb210 to 54 ppb
2007-04-0926.33 ppb310 to 56 ppb
2007-04-0312.5 ppb210 to 25 ppb
2007-03-2729.1 ppb202.2 to 56 ppb
2007-03-2013.85 ppb202.7 to 25 ppb
2007-03-153.7 ppb103.7 ppb
2007-03-1332.05 ppb204.1 to 60 ppb
2007-03-093.8 ppb103.8 ppb
2007-03-0614.6 ppb204.2 to 25 ppb
2007-02-2731.55 ppb203.1 to 60 ppb
2007-02-2113.5 ppb203 to 24 ppb
2007-02-1430 ppb210 to 60 ppb
2007-02-0612 ppb210 to 24 ppb
2007-01-3029.5 ppb210 to 59 ppb
2007-01-2311.5 ppb210 to 23 ppb
2007-01-1729.5 ppb210 to 59 ppb
2007-01-0913.5 ppb210 to 27 ppb
2007-01-0428.5 ppb210 to 57 ppb
2006-12-2813 ppb210 to 26 ppb
2006-12-2030 ppb210 to 60 ppb
2006-12-1260 ppb1060 ppb
2006-12-0510.5 ppb210 to 21 ppb
2006-11-2823.5 ppb210 to 47 ppb
2006-11-2111 ppb210 to 22 ppb
2006-11-1511.5 ppb210 to 23 ppb
2006-11-0812 ppb210 to 24 ppb
2006-10-3111 ppb210 to 22 ppb
2006-10-2624 ppb1024 ppb
2006-10-250 ppb110 ppb
2006-10-1812 ppb210 to 24 ppb
2006-10-1214 ppb210 to 28 ppb
2006-10-0412.5 ppb210 to 25 ppb
2006-10-0245 ppb1045 ppb
2006-09-2612.5 ppb210 to 25 ppb
2006-09-2113 ppb210 to 26 ppb
2006-09-1313.5 ppb210 to 27 ppb
2006-09-0811.5 ppb210 to 23 ppb
2006-08-3011.5 ppb210 to 23 ppb
2006-08-2314.5 ppb210 to 29 ppb
2006-08-1512 ppb210 to 24 ppb
2006-08-0811 ppb210 to 22 ppb
2006-08-0111.5 ppb210 to 23 ppb
2006-07-2511 ppb210 to 22 ppb
2006-07-1912 ppb210 to 24 ppb
2006-07-1113 ppb210 to 26 ppb
2006-07-0513.5 ppb210 to 27 ppb
2006-06-2712.5 ppb210 to 25 ppb
2006-06-2013 ppb210 to 26 ppb
2006-06-1412.5 ppb210 to 25 ppb
2006-06-0612 ppb210 to 24 ppb
2006-05-3112 ppb210 to 24 ppb
2006-05-2311 ppb210 to 22 ppb
2006-05-1612 ppb210 to 24 ppb
2006-05-0912 ppb210 to 24 ppb
2006-05-0211.5 ppb210 to 23 ppb
2006-04-2511.5 ppb210 to 23 ppb
2006-04-1811 ppb210 to 22 ppb
2006-04-1112 ppb210 to 24 ppb
2006-04-0620.5 ppb210 to 41 ppb
2006-04-0525.95 ppb202.9 to 49 ppb
2006-03-2826.85 ppb202.7 to 51 ppb
2006-03-2127 ppb203 to 51 ppb
2006-03-1427.35 ppb202.7 to 52 ppb
2006-03-0729 ppb203 to 55 ppb
2006-02-2827.75 ppb202.5 to 53 ppb
2006-02-2226.9 ppb202.8 to 51 ppb
2006-02-172.9 ppb102.9 ppb
2006-02-1428.45 ppb206.9 to 50 ppb
2006-02-0724 ppb210 to 48 ppb
2006-01-3126.15 ppb202.3 to 50 ppb
2006-01-2425.1 ppb202.2 to 48 ppb
2006-01-1826.95 ppb202.9 to 51 ppb
2006-01-1027.1 ppb203.2 to 51 ppb
2006-01-0325.95 ppb202.9 to 49 ppb
2005-12-2825.35 ppb202.7 to 48 ppb
2005-12-2026.45 ppb202.9 to 50 ppb
2005-12-1324.5 ppb210 to 49 ppb
2005-12-0725.5 ppb210 to 51 ppb
2005-11-2925 ppb210 to 50 ppb
2005-11-2225.5 ppb210 to 51 ppb
2005-11-1625 ppb210 to 50 ppb
2005-11-0925 ppb210 to 50 ppb
2005-11-0125.5 ppb210 to 51 ppb
2005-10-2830 ppb204 to 56 ppb
2005-10-1923.55 ppb204.1 to 43 ppb
2005-10-1224.65 ppb204.3 to 45 ppb
2005-10-0524.65 ppb204.3 to 45 ppb
2005-09-2721.5 ppb210 to 43 ppb
2005-09-2121.5 ppb210 to 43 ppb
2005-09-1423.75 ppb204.5 to 43 ppb
2005-09-0724.75 ppb204.5 to 45 ppb
2005-08-3126.4 ppb204.8 to 48 ppb
2005-08-2423.5 ppb210 to 47 ppb
2005-08-1723 ppb210 to 46 ppb
2005-08-1123 ppb210 to 46 ppb
2005-08-050 ppb110 ppb
2005-08-0223 ppb210 to 46 ppb
2005-07-290 ppb110 ppb
2005-07-2623.5 ppb210 to 47 ppb
2005-07-220 ppb110 ppb
2005-07-1924 ppb210 to 48 ppb
2005-07-150 ppb110 ppb
2005-07-1221 ppb210 to 42 ppb
2005-07-1143.65 ppb2037.3 to 50 ppb
2005-07-080 ppb110 ppb
2005-07-0624 ppb210 to 48 ppb
2005-06-300 ppb110 ppb
2005-06-2826.6 ppb204.2 to 49 ppb
2005-06-240 ppb110 ppb
2005-06-2124.5 ppb210 to 49 ppb
2005-06-170 ppb110 ppb
2005-06-1526.5 ppb204 to 49 ppb
2005-06-100 ppb110 ppb
2005-06-0825 ppb210 to 50 ppb
2005-06-030 ppb110 ppb
2005-05-3124.1 ppb205.2 to 43 ppb
2005-05-2423 ppb210 to 46 ppb
2005-05-1728.85 ppb207.7 to 50 ppb
2005-05-1025 ppb210 to 50 ppb
2005-05-0324.5 ppb210 to 49 ppb
2005-04-2624.5 ppb210 to 49 ppb
2005-04-1925 ppb210 to 50 ppb
2005-04-1447.9 ppb2047.9 ppb
2005-04-1225 ppb210 to 50 ppb
2005-04-0525 ppb210 to 50 ppb
2005-03-2924 ppb210 to 48 ppb
2005-03-2442 ppb1042 ppb
2005-03-2221.5 ppb210 to 43 ppb
2005-03-1522.5 ppb210 to 45 ppb
2005-03-0924.5 ppb210 to 49 ppb
2005-03-0124 ppb210 to 48 ppb
2005-02-2323 ppb210 to 46 ppb
2005-02-1524.5 ppb210 to 49 ppb
2005-02-0819.5 ppb210 to 39 ppb
2005-02-0222.5 ppb210 to 45 ppb
2005-01-2722.5 ppb210 to 45 ppb
2005-01-1922 ppb210 to 44 ppb
2005-01-1223 ppb210 to 46 ppb
2005-01-1145.7 ppb1045.7 ppb
2005-01-0425.65 ppb204.3 to 47 ppb
2004-12-2825 ppb210 to 50 ppb
2004-12-2224.5 ppb210 to 49 ppb
2004-12-1424.5 ppb210 to 49 ppb
2004-11-1625 ppb210 to 50 ppb
2004-11-0928.1 ppb204.2 to 52 ppb
2004-11-0845.05 ppb2044.5 to 45.6 ppb
2004-11-0327.15 ppb204.3 to 50 ppb
2004-10-2624 ppb210 to 48 ppb
2004-10-2027 ppb210 to 54 ppb
2004-10-1222 ppb210 to 44 ppb
2004-10-0724 ppb210 to 48 ppb
2004-09-2925.5 ppb210 to 51 ppb
2004-09-2243.3 ppb1043.3 ppb
2004-09-2126 ppb210 to 52 ppb
2004-09-1424.5 ppb210 to 49 ppb
2004-09-0825 ppb210 to 50 ppb
2004-08-3123.5 ppb210 to 47 ppb
2004-08-2424.5 ppb210 to 49 ppb
2004-08-1051.6 ppb1051.6 ppb
2004-07-2020 ppb210 to 40 ppb
2004-07-1320 ppb210 to 40 ppb
2004-07-0721.5 ppb210 to 43 ppb
2004-06-2821.5 ppb210 to 43 ppb
2004-06-2221.5 ppb210 to 43 ppb
2004-06-1522 ppb210 to 44 ppb
2004-06-0721 ppb210 to 42 ppb
2004-06-0120.5 ppb210 to 41 ppb
2004-05-2521 ppb210 to 42 ppb
2004-05-1821 ppb210 to 42 ppb
2004-05-1020.5 ppb210 to 41 ppb
2004-05-0319.5 ppb210 to 39 ppb
2004-04-2722.5 ppb210 to 45 ppb
2004-04-1921.5 ppb210 to 43 ppb
2004-04-1227.33 ppb310 to 42 ppb
2004-04-0948.3 ppb1048.3 ppb
2004-03-2921.5 ppb210 to 43 ppb
2004-03-2221 ppb210 to 42 ppb
2004-03-1837.3 ppb1037.3 ppb
2004-03-1521 ppb210 to 42 ppb
2004-03-0824 ppb210 to 48 ppb
2004-03-0121 ppb210 to 42 ppb
2004-02-2320 ppb210 to 40 ppb
2004-02-1721 ppb210 to 42 ppb
2004-02-1020.5 ppb210 to 41 ppb
2004-02-0221 ppb210 to 42 ppb
2004-01-2619.5 ppb210 to 39 ppb
2004-01-2219.5 ppb210 to 39 ppb
2004-01-1325.5 ppb210 to 51 ppb
2004-01-0521.5 ppb210 to 43 ppb