2025 Drin k in g Water Qu ality Rep ort
CONSUMER CONFIDENCE REPORT
Background
In 1996, the United States Congress amended the Safe Drinking Water Act by adding a provision requiring all community water systems to deliver a brief annual water quality report. The annual report is referred to as a Consumer Confidence Report (CCR) and is delivered to customers annually no later than July 1st.
The CCR includes information on our source water, the levels of any detected contaminants for the calendar year, compliance with drinking water rules, plus educational material.
Annual Drinking Water Report
The purpose of this report is to provide information about the quality of the water delivered to customers in 2025. This report is mandated by the United States Environmental Protection Agency (USEPA) and it is your right to know where your water comes from and what it contains. We are happy to report that we have consistently delivered water that has met or exceeded the standards set by State and Federal Law.
Secondary Standards - Aesthetic Standards
Chloride mg/L 500
Range 3.7 - 10 N/ A
ND Run off/l eachi ng from natural
deposits; seawater influenceA verage 5.7 21
Hardness mg/L N/ A
Range 130- 220 N/ A
ND
“Hardness” is the sum of polyvalent cations present
in the water, generally magnesium and calcium. The
cation s are usually n aturally occurrin g.A verage 160 260 Sodium mg/L N/ A
Range 12- 25 N/ A
ND “Sodium” refers to the salt present in the water and is gen erally n aturally occurrin g.A verage 16 20
Specific
Conductance µS/ c m 1,600
Range ND - 500 N/ A 300- 610 Substances that form
i ons when i n water;
seawater influenceA verage 288 580 393
Odor un its 3 un its
Range ND - 1 N/ A 1- 2
Naturally - occurin g organ ic m aterials
A verage 1 1 1
Sulfate mg/L 500
Range 14- 51 N/ A
ND
Run off/ leaching from
n atural dep osits;
in dustrial wastesA verage 25 59
Total Dissolved
Solids (TDS) mg/L 1,000
Range 210- 290 250- 380
ND Run off/l eachi ng
from n atural dep ositsA verage 238 323
Turbidity un its 5 un its
Range ND - 0.49 ND(0.020) - 0.51 ND - 5.8
Soil run off
A verage 0.11 0.178 ND
WATER SOURCE
PARAMETER UNITS MCL RANGE/AVERAGE CITY OF RIALTO BLF/ENCANTO WVWD Typical Source of Contaminant What is Maximum
Contaminant Level?
● The California State Water Resources Control Board Division of Drinking Water and Environmental Management
(SWRCB) determines a Maximum Contaminant Level (MCL)
in drinking water.
● The MCL is the highest level of concentration that is allowed in drinking water for a constituent.
● 1ppm =1mg/L (milligram/Liter) =1 drop of water in a 10 gallon aquarium
● 1ppb =1ug/L (microgram/Liter) =1 drop of water in a 10,000 gallon pool
● 1ppt =1ng/L (nanogram/Liter)=1 grain of sugar in a 660,000 gallon pool
FACTS ABOUT OUR SYSTEM
➢ I n 2025, 75% of our total potable
drinking water was sourced from our
groundwater basins, 15% from the
Baseline Feeder (BLF) and 10% was
surface water.
➢ Population 59,264 (GIS Census Data)
➢ Number of Water Service Connections =
12,451
➢ Miles of Water Main = 186.5
➢ Number of Producing Wells = 7
➢ Total Reservoir Capacity = 28 million gallons
➢ Maximum Daily Production = 14.18 million
gallons
➢ Minimum Daily Production = 3.75 million
gallons
➢ Average Daily Production = 9.25 million
gallons
➢ Total Annual Production = 3.391 billion
gallons
Conclusion
The city of Rialto’s
drinking water meets or
exceeds all of the state of
California regulatory
compliance
QUESTIONS 2025 Consumer
Confidence Report