Page 10 - Consumer Confidence Report 2024

2024 Drinking Water Quality Data
Constituents and (Units)
MCL
or
[MRDL]
PHG
(MCLG)
OR
[MRDLG]
Groundwater
Sources
Treated Surface
Water
DLR
Results
(a)
Range
(Min-Max)
Results
(a)
Range
(Min-Max)
MCL
Violation? Typical Source of Contaminant
PRIMARY DRINKING WATER STANDARDS - Health Related Standards
Filter Effluent Turbidity (b)
Metropolitan Water District of
Southern California (MWD)
TT= 1 NTU
0.06 95%<
-0.3 NTU NA NA NR 100%
--
--
No
No Soil runoff
Inorganic Chemicals (c)
Aluminum (mg/l) 1 0.6 0.05 ND ND 0.093 ND - 0.15 No Water treatment chemical or natural deposits
Arsenic (ug/l) 10 0.004 2 <2 ND - 3.1 ND ND No Runoff/leaching from natural deposits
Barium (mg/l) 1 2 0.1 0.12 ND - 0.31 0.12 0.12 No Runoff/leaching from natural deposits
Bromate (ug/l) 10 0.1 1 NR NR 2 ND - 9.2 No Byproduct of Drinking Water Disinfection
Chromium, Hexavalent (ug/l) 10 0.02 0.1 0.54 ND - 1.9 ND ND No Runoff/leaching from natural deposits
Fluoride (mg/l)-natural occurring 2 1 0.1 0.26 0.19-0.4 NR NR No Runoff/leaching from natural deposits
Fluoride (mg/l)-treatment related 2 1 0.1 NR NR 0.7 0.3-0.8 No Water additive for dental health
Nitrate as N (mg/l) 10 10 0.4 <0.4 ND - 3.4 ND ND No Runoff and leaching from fertilizer use
Perchlorate (ug/l) 6 1 1 <1 ND - 2.6 ND ND No Industrial waste discharge
RADIOACTIVITY (c)
Gross Alpha Activity (pCi/l) 15 (0) 3 <3 ND - 3.4 ND ND No Runoff/leaching from natural deposits
Gross Beta Activity (pCi/l) 50 (0) 4 NR NR ND ND - 5 No Decay of natural and man-made deposits
Uranium (pCi/l) 20 0.43 1 1.1 ND - 2.2 ND ND - 3 No Runoff/leaching from natural deposits
SECONDARY DRINKING WATER STANDARDS - Aesthetic Standards, Not Health Related (c)
Aluminum (ug/l) 200 600 50 ND ND 93 ND - 150 No Water treatment chemical or natural deposits
Chloride (mg/l) 500 NA NA 30 9.7 - 61 110 96 - 120 No Runoff/leaching from natural deposits
Color (Color Units) 15 NA NA ND ND 1 1 No Naturally occurring organic materials
Odor (Threshold Odor Number) 3 NA NA 1 1 ND ND No Naturally occurring organic materials
Specific Conductance (umho/cm) 1,600 NA NA 530 340 - 860 1,000 910 - 1,100 No Substances that form ions in water
Sulfate (mg/l) 500 NA NA 39 18 - 79 230 200 - 250 No Naturally occurring organic materials
Total Dissolved Solids (mg/l) 1,000 NA NA 320 180 - 540 630 570 - 690 No Runoff/leaching from natural deposits
Turbidity (NTU) 5 NA NA 0.12 ND - 0.3 ND ND No Soil runoff
ACRONYMS & FOOTNOTES
AL = Action Level
DLR = Detection Limit for Purposes of Reporting
MCL = Maximum Contaminant Level
MCLG = Maximum Contaminant Level Goal
mg/l = parts per million or milligrams per liter
ng/l = parts per trillion or nanograms per liter
MRDL = Maximum Residual Disinfectant Level
MRDLG = Maximum Residual Disinfectant Level Goal
NA = No Applicable Limit
ND = Not Detected or average less than the DLR
NL= Notification Level
NR = Monitoring Not Required
NTU = Nephelometric Turbidity Units
pCi/l = picoCuries per liter
PHG = Public Health Goal
ug/l = parts per billion or micrograms per liter
umho/com = micromhos per centimeter
“<” = constituent was detected but average or test results in less than the DLR
N/A= Not applicable(a)
The results reported in the table are average concentrations of the constituents detected in your drinking water during 2024 or from the most recent tests, except for Filter Effluent Turbidity, Total Trihalomethanes (TTHM), Haloacetic Acids (HAA5), Chlorine Residual, Lead, and
Copper which are described below. Surface water source includes results from the Metropolitan Water District of Southern California (Weymouth Plant).
(b)
Turbidity is a measure of the cloudiness of the water. It is a good indicator of the effectiveness of the water filtration system. The table gives the highest single turbidity measurement that was recorded and the lowest monthly percentage of samples meeting the turbidity
requirement.
(c)
Constituents were tested in groundwater and surface water sources in 2020 to 2024, except for radioactivity in groundwater sources which was tested in 2016, 2019, 2022, and 2023. The most recent results are included.
(d)
Samples were collected in the distribution system. For TTHM, HAA5 and chlorine residual, the highest quarterly running annual average in 2024 is reported as “Results”, while he maximum and minimum of the individual results are reported as “Range”. The MCL for color, odor
and turbidity is a secondary standard. Color was not detected in 2024.
(e)
Concentrations were measured at the tap at 41 residences in the water system. The 90th percentile concentration is reported in the table. Lead was detected in five samples above the DLR; one of the lead results exceeded the regulatory Action Level. Copper was detected
above the DLR in thirty-nine samples; none of the copper results exceeded the Action Level. The samples were collected in June 2022. The concentrations reported may not be indicative of the water at your tap; copper was not detected in the City’s water supply sources and
lead is not required to be tested at the City’s water supply sources.
pg. 9