Irvine Ranch Water District Local and Imported Drinking Water Quality Results for 2023 PHG Average Average Average MRDLG Local Treated Local Treated Imported MWD Range of MCL Typical Source
Chemical
MCL MRDL
(MCLG)
Groundwater
Surface Water
Treated Water
Detections
Violation?
of Contaminant
Radiologicals – Tested in 2023 Alpha Radiation (pCi/L)
15 50 20
0 0
3.6 NR 2.1
5.4 5.1 1.7
<3 <3 1.0
ND – 5.4 ND – 6.0 ND – 3.2
No No No
Erosion of Natural Deposits
Beta Radiation (pCi/L)
Decay of natural and man-made deposits
Uranium (pCi/L)
0.43
Erosion of Natural Deposits
Inorganic Chemicals – Tested in 2023 Aluminum (ppm)
1
0.6
ND
ND <2
Highest RAA = 0.105
ND – 0.070 ND – 8.38 ND – 0.115 ND – 6.3 1.5 – 3.2 ND – 0.72
No No No No No No No
Treatment Process Residue, Natural Deposits
Arsenic (ppb) Barium (ppm) Bromate (ppb) Chlorine (ppm)
10
0.004
2.16
ND ND ND NR NR 0.7
Erosion of Natural Deposits Erosion of Natural Deposits
1
2
ND NR NR
<0.100
10
0.1 4.0
NR 2.5
Byproduct of drinking water ozonation
4.0
Drinking water disinfectant added for treatment
Fluoride (ppm) naturally-occurring Fluoride (ppm) treatment-related
2
1
0.26
0.32
Erosion of Natural Deposits Water Additive for Dental Health
Control Range 0.6 – 1.2 ppm
NR
NR
0.5-0.8
Optimal Level 0.7 ppm
Nitrate (ppm as N)
10 10
10 10
1.6 1.6
ND ND
0.7 0.7
ND – 4.3 ND – 4.3
No No
Fertilizers, Septic Tanks Fertilizers, Septic Tanks
Nitrate+Nitrite (ppm as N)
Secondary Standards* – Tested in 2023 Aluminum (ppb)
200* 500*
600
ND
ND
Highest RAA = 105
ND – 70
No No No No No No No No n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a No n/a n/a n/a n/a n/a
Treatment Process Residue, Natural Deposits Leaching from Natural Deposits; Seawater Influence
Chloride (ppm) Color (color units)
n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a
34.4
89.2
66.0
19.0 – 111
15*
<3
<3
2 2
ND – 5 ND – 4
Naturally-Occurring Organic Substances Naturally-Occurring Organic Materials Ions in Water; Seawater Influence Runoff or Leaching from Natural Deposits Runoff or Leaching from Natural Deposits
Odor (TON)
3*
1
1
Specific Conductance (µmho/cm)
1,600*
429 56.4 247
1,001
642 122 394
229 – 1085 27.0 – 240 128 – 672 ND – 0.55 47.4 – 154 47.4 – 153 ND – 0.24 0.04 – 0.18 16.6 – 81.4 <0.6 – 1.3
Sulfate (ppm)
500*
217 612
Total Dissolved Solids (ppm)
1,000*
Turbidity (NTU)
5*
<0.10
<0.10
ND
Erosion of Natural Deposits
Unregulated Contaminants – Tested in 2023 Alkalinity, Total (ppm as CaCO 3 )
Not Regulated Not Regulated
92.8 70.6 0.15
138 137 0.14
84 NR
Runoff or Leaching from Natural Deposits Runoff or Leaching from Natural Deposits Runoff or Leaching from Natural Deposits Runoff or Leaching from Natural Deposits Runoff or Leaching from Natural Deposits Runoff or Leaching from Natural Deposits Byproduct of Drinking Water Chlorination
Bicarbonate (ppm as HCO 3 )
Boron (ppm)
NL = 1
0.13
Bromide (ppm) Calcium (ppm) Carbonate (ppm) Chlorate (ppb)
Not Regulated Not Regulated Not Regulated
<0.10
NR
NR
28.2 <0.6
74.7 <0.6
38.0
NR
NL = 800
NR
NR
19.0 12.4 0.54 160
19.0
Corrosivity (Aggressiveness) Corrosivity (Langlier Index) Hardness, Total (ppm as CaCO 3 ) Hardness, Total (grains/gal) Hexavalent Chromium (ppb)
Not Regulated Not Regulated Not Regulated Not Regulated Not Regulated Not Regulated Not Regulated Not Regulated Not Regulated Not Regulated
11.8 0.20 93.3
12.4 0.59 297 17.4
10.8 – 12.9 (-)0.72 – 1.1 57.2 – 321 3.3 – 18.8 ND – 0.14 3.1 – 29.9 ND – 15.2 7.1 – 8.8 ND – 4.3 20.7 – 112
Elemental Balance in Water Elemental Balance in Water
Runoff or Leaching from Natural Deposits Runoff or Leaching from Natural Deposits Erosion of Natural Deposits; Industrial Discharge Runoff or Leaching from Natural Deposits Drinking Water Treatment Chemical for Aesthetic Quality
5.5 0.1 8.0 7.1 8.2 1.2
9.4 ND
0.02 **
ND
Magnesium (ppm) Molybdenum (ppb)
n/a n/a n/a n/a n/a n/a n/a
27.9
15.0
4.8 8.0 4.2
NR 8.5 3.4
pH (pH units)
Acidity, Hydrogen Ions
Potassium (ppm)
Runoff or Leaching from Natural Deposits Runoff or Leaching from Natural Deposits Various Natural and Man-Made sources Runoff or Leaching from Natural Deposits
Sodium (ppm)
48
92
69
Total Organic Carbon (ppm)
TT
0.4 3.9
1.8 ND
2.4 3.1
ND – 3.0 ND – 6.4
TT
Vanadium (ppb)
NL = 50
n/a
ppb = parts-per-billion; ppm = parts-per-million; ppt = parts-per-trillion; pCi/L = picoCuries per liter; NTU = nephelometric turbidity units; ND = not detected; n/a = not applicable; NR = not required to be tested; < = average is less than the detection limit for reporting purposes; MCL = Maximum Contaminant Level; (MCLG) = federal MCL Goal; PHG = California Public Health Goal; µmho/cm = micromho per centimeter; NL = Notification Level; TT = Treatment Technique; RAA = Highest Running Annual Average
Your water has been tested for many more chemicals than are listed above, including metals (such as mercury), pesticides and volatile organic compounds. Chemicals not detected in any water sources are not included in the table. *Contaminant is regulated by a secondary standard to maintain aesthetic qualities (taste, odor, color). **There is currently no MCL for hexavalent chromium. The previous MCL of 10 ppb was withdrawn on September 11, 2017.
Turbidity – combined filter effluent
Treatment Technique
Turbidity Measurements
TT Violation?
Typical Source
Baker Water Treatment Plant
1) Highest single turbidity measurement
0.1 NTU
0.03
No No
Soil Run-Off Soil Run-Off
2) Percentage of samples less than or equal to 0.3 NTU
100%
100%
Metropolitan Water District Diemer Filtration Plant 1) Highest single turbidity measurement
0.3 NTU
0.08
No No
Soil Run-Off Soil Run-Off
2) Percentage of samples less than or equal to 0.3 NTU
100%
100%
Turbidity is a measure of the cloudiness of the water, an indication of particulate matter, some of which might include harmful microorganisms. Low turbidity in treated surface water is a good indicator of effective filtration. Filtration is called a “treatment technique” (TT). A treatment technique is a required process intended to reduce the level of contaminants in drinking water that are difficult and sometimes impossible to measure directly.
Unregulated Chemicals Requiring Monitoring at Entry Points to the Distribution System
Chemical
Notification Level
PHG
Average Local and Imported
Range of Detections
Most Recent Sampling Date
Bromide (ppm)
n/a n/a
n/a n/a n/a n/a n/a
0.20 <0.3 0.88
0.025 – 0.72
2020 2020 2020 2020 2023
Germanium, Total (ppb) Manganese, Total (ppb) Total Organic Carbon (ppm)
ND – 0.8 ND – 2.7 0.06 – 6.5 ND – 64.2
MCL = 50*
n/a n/a
1.2
Lithium, Total (ppb)
45.8
*Contaminant is regulated by a secondary standard
~ 6 ~
Powered by FlippingBook