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Graham County · Arizona · EPA SDWIS 2026Q2

Bonita Water Quality

0Good

11 water-quality findings on record in the public supply.

What's in Bonita's water

Haloacetic Acids (HAA5)

Violation on record

Legal limit60 ppb

3 EPA violations on record (most recent 2025). HAA5 are a second group of chlorine disinfection byproducts formed when chlorine reacts with organic matter in water. Long-term exposure is associated with increased cancer risk and possible developmental effects. They commonly occur together with trihalomethanes.

Total Trihalomethanes (TTHM)

Violation on record

Legal limit80 ppb

2 EPA violations on record (most recent 2025). TTHM form when chlorine used to disinfect water reacts with natural organic matter. Long-term exposure has been linked to increased cancer risk and to harm in pregnancy. Levels often rise in warmer months and in systems with more organic material.

PFOA

Violation on record

Legal limit4 ppt

1 EPA violation on record (most recent 2020). PFOA is a long-lived "forever chemical" once used to make nonstick and stain-resistant products. It builds up in the body over time and is associated with certain cancers, immune effects, and developmental harm. EPA finalized a strict drinking-water limit for it in 2024.

Barium

Violation on record

Legal limit2,000 ppb

1 EPA violation on record (most recent 2020). Barium dissolves into water naturally from rock and can also come from drilling and industrial discharges. Drinking elevated levels over time can raise blood pressure and stress the cardiovascular system. It is fairly common in some groundwater sources.

Selenium

Violation on record

Legal limit50 ppb

1 EPA violation on record (most recent 2020). Selenium is a naturally occurring element that is a necessary nutrient at trace levels but toxic in excess. Long-term high exposure can damage the nervous system, hair, and nails. It enters water from natural deposits and from irrigation drainage.

PFOS

Violation on record

Legal limit4 ppt

1 EPA violation on record (most recent 2020). PFOS is another "forever chemical" from older firefighting foams and consumer coatings. Like PFOA it accumulates in the body and is linked to immune, thyroid, liver, and developmental effects. EPA set an enforceable limit for it in 2024.

Cadmium

Violation on record

Legal limit5 ppb

1 EPA violation on record (most recent 2020). Cadmium enters water from corroded galvanized pipes and from industrial and mining discharges. Long-term exposure mainly damages the kidneys and can weaken bones. It is toxic even at low levels over time.

Atrazine

Violation on record

Legal limit3 ppb

1 EPA violation on record (most recent 2020). Atrazine is one of the most widely used weed killers and reaches water through agricultural runoff. It is an endocrine disruptor associated with reproductive and developmental effects, and concentrations tend to spike seasonally after application. It is most common in farming regions.

Nitrate

Violation on record

Legal limit10 ppm

1 EPA violation on record (most recent 2020). Nitrate enters water mainly from fertilizer runoff, septic systems, and animal waste. High levels can interfere with the blood's ability to carry oxygen, a special danger for infants. Long-term low-level exposure has also been linked to elevated cancer risk in some studies.

Arsenic

Violation on record

Legal limit10 ppb

1 EPA violation on record (most recent 2020). Arsenic is a naturally occurring element that dissolves into groundwater from rock and is also released by mining and industry. Long-term exposure is associated with several cancers and with skin, cardiovascular, and developmental harm. It is common in parts of the Southwest.

Fluoride

Violation on record

Legal limit4,000 ppb

1 EPA violation on record (most recent 2020). Fluoride occurs naturally in groundwater and is also added by many utilities to reduce tooth decay. At high natural levels it can damage developing teeth and, over long exposure, weaken bones. The federal limit targets these high-level health effects rather than the low levels used for dental benefit.

Water hardness

very hard

Bonita's water is very hard. Hardness isn't a health risk, but it drives scale on fixtures and water heaters, shortens appliance life, and leaves skin and hair dry.

Your water provider

ADOC ASPC FORT GRANT

Population served
800
PWSID
AZ0405303
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