The Power of Information

National Drinking Water Database


Riverview Wd Utilities - San Diego, CA


Serves 16,000 people

Manganese

Manganese is a naturally occurring element released from mineral deposits as well as industrial use.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
2 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)
2 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
34 days
Tests ConductedNumber of individual tests done for this contaminant
196 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
ManganeseManganese is a naturally occurring element released from mineral deposits as well as industrial use.27.65 ppb
60.7 ppb
Yes
50 ppb
Yes
50 ppb
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 Manganese

Health Based Limits for Manganese

StandardDescriptionLevel
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.50 ppb
National Secondary Drinking Water RegulationsA National Secondary Drinking Water Regulation is a non-enforceable guideline regarding contaminants that may cause cosmetic effects (such as taste, odor, or color). Some states choose to adopt them as enforceable standards. Source: U.S. Environmental Protection Agency. 50 ppb
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.300 ppb
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.300 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.1000 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.1000 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.1600 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2006-10-0215 ppb650 to 90 ppb
2006-09-1210.8 ppb650 to 64.8 ppb
2006-07-0631.87 ppb620 to 73.4 ppb
2006-06-017.77 ppb650 to 46.6 ppb
2006-05-0333.55 ppb620 to 110 ppb
2006-04-0632.55 ppb620 to 91 ppb
2006-03-0714.52 ppb630 to 32.5 ppb
2006-02-1432.37 ppb620 to 104 ppb
2006-01-1027.28 ppb620 to 83 ppb
2005-12-140 ppb660 ppb
2005-11-0821.12 ppb520 to 41.5 ppb
2005-10-1217.42 ppb520 to 36.4 ppb
2005-09-120 ppb550 ppb
2005-08-1840.08 ppb4034.9 to 53.4 ppb
2005-08-0127 ppb520 to 57.5 ppb
2005-07-0537.3 ppb620 to 99 ppb
2005-06-1428.33 ppb620 to 90 ppb
2005-05-0531.67 ppb620 to 90 ppb
2005-04-0718.17 ppb620 to 40 ppb
2005-03-0314.48 ppb650 to 86.9 ppb
2005-02-0160.7 ppb620 to 224 ppb
2005-01-0557.87 ppb620 to 135 ppb
2004-12-0229.17 ppb620 to 74 ppb
2004-11-0119.77 ppb630 to 64.2 ppb
2004-10-0630.75 ppb620 to 91.5 ppb
2004-09-1329.67 ppb620 to 82.7 ppb
2004-08-0931.88 ppb620 to 93.4 ppb
2004-07-0237.62 ppb620 to 113 ppb
2004-06-0136.02 ppb620 to 99.9 ppb
2004-05-0432.72 ppb620 to 90.5 ppb
2004-04-0734.82 ppb620 to 87.5 ppb
2004-03-0226.68 ppb520 to 78.8 ppb
2004-02-0238.14 ppb510 to 94.7 ppb
2004-01-0733 ppb620 to 109 ppb