2023 WQCCR - FINAL

2023 Water Quality Results

Chino Hills Water System

Range and Average

State MCL [MRDL]

Parameters [units]

PHG [MCLG]

Typical Source of Contaminant

Chino Hills Wells

Chino 1 Desalter

Monte Vista Water

REGULATED CONTAMINANTS WITH SECONDARY DRINKING WATER STANDARDS, Sampled 2022-2023

Range

N/A

N/A

ND - 47

Erosion from natural deposits; residue from some surface water treatment processes

Aluminum* [ppb]

200

N/A

Average

N/A

N/A

39

Range

N/A

N/A

7.7 - 32

Chloride [ppm]

Runoff/leaching from natural deposits; seawater influence

N/A

500

Average

N/A

75

38

Range

N/A

N/A

ND - 110

Foaming Agents MBAS [ppb]

Municipal and industrial waste discharges

500

N/A

Average

N/A

N/A

6.9

Range

N/A

N/A

1 - 1

Odor-Threshold [Units]

3

N/A

Naturally-occuring organic material

Average

N/A

N/A

1

Range

N/A 350 - 540 360 - 560

Specific Conductance [uS/cm]

Substances that form ions when in water; seawater influence

N/A

1,600

Average

N/A

470

370

Range

N/A

N/A

29 - 43

Sulfate [ppm]

Runoff/leaching from natural deposits; industrial wastes

500

N/A

Average

N/A

6.1

46

Range

N/A 210 - 370 210 - 400

Total Dissolved Solids (TDS) [ppm]

Runoff/leaching from natural deposits

1,000

N/A

Average

N/A

304

211

Range

N/A

N/A

ND - .54

Turbidity [units]

5

N/A

Soil runoff

Average

N/A

N/A

0.1

Common Contaminants

The sources of drinking water (both tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs, and wells. As water travels over the surface of the land or through the ground, it dissolves naturally-occurring minerals and, in some cases, radioactive material, and can pick up substances resulting from the presence of animals or from human activity. Microbial contaminants - such as viruses and bacteria that may come from sewage treatment plants, septic systems, agricultural livestock operations, and wildlife. Inorganic contaminants - such as salts and metals that can be naturally-occurring or result from urban storm water runoff, industrial or domestic wastewater discharges, oil and gas production, mining, or farming. Pesticides and herbicides - may come from a variety of sources such as agriculture, urban storm water runoff, and residential uses.

Organic chemical contaminants - including synthetic and volatile organic chemicals that are by-products of industrial processes and petroleum production, and can also come from gas stations, urban storm water runoff, agricultural application, and septic systems. Radioactive contaminants - can be naturally occuring or be the result of oil and gas production and mining activities. In order to ensure that tap water is safe to drink, the U.S. Environmental Protection Agency (EPA) and the State Water Resources Control Board (SWRCB) prescribe regulations that limit the amount of certain contaminants in water provided by public water systems. State Board regulations also establish limits for contaminants in bottled water that provide the same protection for public health.