GROUNDWATER SURFACE WATER MCL MCLG or MAJOR SOURCES IN DRINKING WATER AVERAGE RANGE AVERAGE RANGE PHG (a )
ORGANIC CHEMICALS
INORGANIC CHEMICALS ( b )
ND ND 134 ND-260 1,000 600 Erosion of natural deposits; residue from surface water treatment processes 100 ND-110 ND ND-107 1,000 2,000 Oil drilling waste and metal refinery discharge; erosion of natural deposits
0.26 0.24-0.27 0.70 0.40-0.90 2 1 Erosion of natural deposits, water additive that promotes strong teeth RADIOLOGICAL ( c )
ND ND ND ND-3 15 0 Erosion of natural deposits
NA NA ND ND-7 50 0 Decay of natural and man-made deposits ND ND ND ND-2 0.019 Erosion of natural deposits
ND ND 1.3 ND-3 20 0.43 Erosion of natural deposits
DISTRIBUTION SYSTEM MAJOR SOURCES IN DRINKING WATER
MCL
(STATE/FEDERAL)
MCLG or
PHG (a)
5% of Monthly
Samples/TT 0% Naturally present in the environment
0 0
DISTRIBUTION SYSTEM MAJOR SOURCES IN DRINKING WATER
4.0 4.0 Drinking water disinfectant added for treatment MCL MCLG or
PHG (a) MAJOR SOURCES IN DRINKING WATER
80 - By-product of drinking water disinfection
60 - By-product of drinking water disinfection
10 0.1 By-product of drinking water disinfection
DISTRIBUTION SYSTEM MCLG or
PHG (a)
2 1 Runoff and leaching from natural deposits; water additive that promotes strong teeth; discharge from fertilizer and aluminum factories
None
Fluoride (mg/L)
Fluoride (mg/L) ( e )
Bromate (µg/L) ( e )
Haloacetic Acids (µg/L)
Trihalomethanes-TTHMS (µg/L)
No. of Acute Violations
1.6 0.4 - 2.8
HIGHEST LRAA RANGE OF RESULTSDISINFECTION
BYPRODUCTS ( d )
Chlorine/chloramine Residual
(mg/L as CL2)
41 19-78
13 6.4-19
AVERAGE RANGE
4.4 ND-6.0
0.7 0.4-0.9
MANHATTAN BEACH 2020 ANNUAL WATER QUALITY REPORT
Only detected results are shown, and are from the most recent testing performed in accordance with state and federal drinking water regulations HIGHEST % POSITIVE
IN A MONTH RANGE % POSITIVE
SUBSTANCES MONITORED FOR PUBLIC HEALTH
Total Coliform Bacteria
Barium (µg/L)
Gross Alpha (pCi/L)
Gross Beta (pCi/L)
Radium 228 (pCi/L)
Uranium (pCi/L)
Aluminum (µg/L)
0 0
AVERAGE RANGE
1.7% ND-2
MRDLGMRDL
MICROBIALS
DISINFECTION RESIDUAL
INORGANICS MCL MAJOR SOURCES IN DRINKING WATER
DISTRIBUTION SYSTEM MCLG or
RANGE # SITES
ABOVE PHG (a)
ND-0.64 0 1.3 AL 0.3 Internal corrosion of household plumbing, erosion of natural deposits ND-43 1 15 AL 0.2 Internal corrosion of household plumbing, industrial manufacturer dischargesLead (µg/L) Copper (mg/L) 0.26 ( f )
ND ( f )
90TH PERCENTILE
LEAD AND COPPER AT
THE TAP AL MAJOR SOURCES IN DRINKING WATER
( g )
GROUNDWATER SURFACE WATER MCLG or
AVERAGE RANGE AVERAGE RANGE PHG (a)
ND ND 134 ND-260 200 600 Erosion of natural deposits, surface water treatment process residue 205 170-240 80 51-94 500 - Runoff/leaching from natural deposits, seawater influence
2.5 ND-5 1.3 1-3 15 - Naturally-occurring organic materials 1450 1300-1600 799 451-975 1,600 - Substances that form ions when in water, seawater influence
0.01 ND-0.03 ND ND 0.5 - Municipal and industrial waste discharges 110 100-120 ND ND 300 - Leaching from natural deposits, industrial wastes 55 49-60 ND ND 50, NL = 500 - Leaching from natural deposits 3 2-4 2 2 3 - Naturally-occurring organic materials
140 110-170 161 53-217 500 - Runoff/leaching from natural deposits, industrial wastes 800 680-920 481 255-603 1,000 - Runoff/leaching from natural deposits
0.29 0.25-0.33 ND ND 5 - Soil runoff
DISTRIBUTION SYSTEM MCLG or
PHG (a)
5 - Soil runoff
GROUNDWATER SURFACE WATER Notification
AVERAGE RANGE AVERAGE RANGE Level or PHG (a)
200 180-220 106 79-120 -
101 82-120 52 25-67 -
34 29-38 21 11-26 -
11 10-11 3.9 2.5-4.7 -
120 100-140 79 46-98 -
390 325-455 212 107-269 -
GROUNDWATER SURFACE WATER Notification
AVERAGE RANGE AVERAGE RANGE Level or PHG (a)
NA NA 143 130-170 1,000
NA NA 57 27-76 800
NA NA ND ND-3.1 10
GROUNDWATER SURFACE WATER Notification
AVERAGE RANGE AVERAGE RANGE Level or PHG (a)
0.49 0.48-0.50 0.52 0.32-0.69 -
7.7 7.7-7.8 8.2 8.1-8.4 -
Aluminum (µg/L) ( h )
Manganese (µg/L) ( i )
Iron (µg/L)
Foaming Agents (mg/L)
Conductivity (umhos/cm)
Odor (threshold odor number)
Turbidity (NTU)
Total Dissolved Solids (mg/L)
Color (color units)
Chloride (mg/L)
Magnesium (mg/L)
Calcium (mg/L)
Alkalinity (mg/L)
Turbidity (NTU)
MAJOR SOURCES IN DRINKING WATER
Runoff/leaching from natural deposits; industrial wastes Byproduct of drinking water chlorination; industrial processes Byproduct of drinking water chloramination; industrial processes pH (standard unit)
Natural/industrially-influenced balance of hydrogen/carbon/oxygen in water
SECONDARY STANDARDS MONITORED AT THE SOURCE FOR AESTHETIC PURPOSES
SUBSTANCES MONITORED IN THE DISTRIBUTION SYSTEM-FOR AESTHETIC PURPOSES Sulfate (mg/L)
0.57 0.28-0.97
OTHER PARAMETERS
Salt present in the water; naturally-occurring
Runoff/leaching of natural deposits; sum of polyvalent cations, generally magnesium and calcium present in the water
MAJOR SOURCES IN DRINKING WATER
Total Hardness (mg/L)
Sodium (mg/L)
Runoff/leaching of natural deposits; carbonate, bicarbonate, hydroxide, and occasionally borate, silicate, and phosphate
Runoff/leaching of natural deposits
Runoff/leaching of natural deposits
Salt present in the water; naturally-occurring
AVERAGE RANGE
MAJOR SOURCES IN DRINKING WATER
Corrosivity (as saturation index) ( j )
N-Nitrosodimethylamine (ng/L)
Chlorate (µg/L)
Boron (µg/L)
Potassium (mg/L)
SUBSTANCES WITH
NOTIFICATION LEVELS
MISCELLANEOUS
CONSTITUENT ( b )
CONSTITUENT
CONSTITUENT ( b )
GENERAL MINERALS
MCL MAJOR SOURCES IN DRINKING WATER
MCL MAJOR SOURCES IN DRINKING WATER
NTU = Nephelometric Turbidity Units
pCi/L = picoCuries per Liter
umhos/cm = Micromhos per centimeter
is set to protect against unpleasant effects such as color, taste, odor, and staining of laundry and Treatment Technique (TT) : A required process intended to reduce the level of a contaminant in drinking water.
Regulatory Action Level (AL) : The concentration of a contaminant which, if exceeded, triggers treatment or other requirements that a water system must follow.
Primary Drinking Water Standard (PDWS) : MCLs and MRDLs for contaminants that affect health along with their monitoring and reporting requirements, and water treatment requirements.
Maximum Contaminant Level (MCL): The highest level of a contaminant that is allowed in drinking water set by the State and the Environmental Protection Agency (EPA). Primary MCLs are set as close to the PHGs (or MCLGs) as is economically and technologically feasible. Secondary MCLs are set to protect odor, taste, and appearance of drinking water. MCLs are based on the most stringent value between State and EPA MCLs. A contaminant with no MCL but requires compliance with other drinking water regulations is designated either as Treatment Technique (TT), Action Level (AL), or Notification Level (NL).
Maximum Contaminant Level Goal (MCLG): The level of a contaminant in drinking water below which there is no known or expected health risk. MCLGs are set by the U.S.EPA.
Notification Level (NL): Notification levels are health-based advisory levels established by the Division of Drinking Water (DDW) for chemicals in drinking water that lack maximum contaminant levels (MCLs). When chemicals are found at concentrations greater than their notification levels, certain requirements and recommendations apply. The level at which DDW recommends removal of a drinking water source from service is called the "response level." ( f ) 90th percentile from the most recent sampling at selected customer taps (40 samples in 2019) ( e ) Data are taken from imported water at MWD's treatment plant effluents. ( h ) Constituent has primary standard/action level and secondary standard ( i ) Manganese exceeded the secondary MCL in one well in 2018. Water from this well is blended with imported surface water in the distribution system to reduce concentrations. The secondary MCL plumbing fixtures. A manganese secondary MCL exceedance does not pose a health risk. ( j ) Positive SI= non-corrosive; tendency to precipitate and/or deposit scale on pipes. Negative SI= corrosive tendency to dissolve calcium carbonate (measured at 20⁰ C) Reference: Standard Methods (SM2330) Location Running Annual Average (LRAA) : Locational Running Annual Averages are calculated as an average of all samples collected within a 12-month period at a single site.
Public Health Goal (PHG) : The level of a contaminant in drinking water below which there is no known or expected risk to health. PHGs are set by the California Environmental Protection Agency.
Maximum Residual Disinfectant Level Goal (MRDLG): The level of a disinfectant added for water treatment below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants.
Maximum Residual Disinfectant Level (MRDL): The highest level of a disinfectant added allowed in drinking water. There is strong evidence that disinfectant additions are necessary for microbial control. ( g ) There were 7 schools in the service area that requested lead testing.
ABBREVIATIONS
ND = Not Detected at the reporting limit
NA = Not Analyzed during this reporting period
mg/L = Milligrams per Liter or parts per million (equivalent to 1 drop in 42 gallons) µg/L = Micrograms per Liter or parts per billion (equivalent to 1 drop in 42,000 gallons) ng/L = Nanograms per Liter or parts per trillion (equivalent to 1 drop in 42,000,000 gallons) ( a ) Advisory Levels include: California PHGs and NLs; and Federal MCLGs and MRDLGs. ( b ) The State allows monitoring some contaminants less than once per year because the ( d ) LRAA is used to calculate averages, ranges, and State and Federal MCL compliance. ( c ) The most current results for radiological data cover samples from 2015-2018. concentrations do not vary frequently. This data is from the most recent monitoring (2018-2020).
FOOTNOTES
DEFINITIONS