Understanding El Paso Tap Water Quality

The Difference Between "Legal" and "Safe"

Water quality reports often list contaminants that are below the Maximum Contaminant Level (MCL) set by the EPA. These are the legal limits for water utilities to remain compliant. However, many health organizations, including the Environmental Working Group (EWG), recommend much lower levels to protect long-term health, particularly for developing bodies.

In El Paso, tap water consistently meets legal requirements but frequently exceeds these stricter health guidelines. Below is a breakdown of the contaminants found in local water, their measured levels, and the associated health risks.

Data Overview

Sources: 2024 Consumer Confidence Report (CCR) and EWG El Paso Water Utilities Report. Note: All levels are compared against the EPA Legal Limit and the EWG Health Guideline.

1. Heavy Metals & Radionuclides

These substances occur naturally in the earth or enter water through industrial processes. They do not evaporate and can accumulate in the human body over time.

Arsenic

  • El Paso Level: 4.07 ppb
  • Legal Limit: 10 ppb
  • EWG Health Guideline: 0.004 ppb
  • The Gap: El Paso levels are roughly 1,000 times higher than the recommended health guideline.

Health Risks:

  • Infants & Pregnant Women: Arsenic crosses the placenta. Exposure during pregnancy is linked to developmental delays, reduced IQ in children, and increased risk of miscarriage.
  • General Population: Long-term exposure is a known cause of skin, bladder, and lung cancers. It can also lead to cardiovascular disease and skin lesions.

Hexavalent Chromium (Chromium-6)

  • El Paso Level: 2.4 ppb
  • Legal Limit: None (EPA has no enforceable limit for this specific form yet)
  • EWG Health Guideline: 0.02 ppb
  • The Gap: Levels are 120 times higher than the health guideline.

Health Risks:

  • Infants & Pregnant Women: A known carcinogen that may impact fetal growth and development.
  • General Population: Strongly linked to stomach and intestinal cancers. Can cause liver and kidney damage with prolonged exposure.

Uranium & Radium

  • El Paso Level: Uranium (2.46 pCi/L), Radium (0.33 pCi/L)
  • Legal Limits: Uranium (20 pCi/L), Radium (5 pCi/L)
  • EWG Health Guideline: Uranium (0.43 pCi/L), Radium (0.05 pCi/L)

Health Risks:

  • Infants & Pregnant Women: Radioactive elements can affect kidney function in developing fetuses and accumulate in bone tissue, potentially impacting skeletal development.
  • General Population: Primary risks include kidney damage and an increased risk of bone cancer and leukemia over a lifetime.

2. Disinfection Byproducts (DBPs)

These chemicals form when chlorine (used to kill bacteria) reacts with organic matter in the water. While necessary for preventing bacterial outbreaks, the byproducts themselves carry health risks.

Total Trihalomethanes (TTHMs) & Haloacetic Acids (HAAs)

  • El Paso Levels: TTHMs (21.2 ppb), HAA5 (6.98 ppb), HAA9 (18.1 ppb)
  • Legal Limits: TTHMs (80 ppb), HAA5 (60 ppb)
  • EWG Health Guideline: TTHMs (0.15 ppb), HAA5 (0.1 ppb)
  • The Gap: Levels are significantly higher than health guidelines (up to 100x for TTHMs).

Health Risks:

  • Infants & Pregnant Women: High exposure is linked to low birth weight, preterm birth, and neural tube defects (such as spina bifida). Brominated byproducts (like Bromoform) are particularly concerning for fetal development.
  • General Population: Long-term consumption is strongly associated with an increased risk of bladder cancer. Some compounds are suspected reproductive toxins.

3. Nitrates & Nitrites

Primarily originating from agricultural runoff and septic systems.

  • El Paso Level: 0.917 ppm (Nitrate)
  • Legal Limit: 10 ppm
  • EWG Health Guideline: 0.14 ppm

Health Risks:

  • Infants (<6 months) — Critical Risk: Nitrates convert to nitrites in the body, which block oxygen transport in the blood. This can cause Methemoglobinemia (Blue Baby Syndrome), a potentially fatal condition.
  • Pregnant Women: Linked to preterm birth and low birth weight.
  • General Population: Long-term exposure is associated with thyroid dysfunction and an increased risk of colorectal cancer.

4. Lead & Copper (Plumbing Sources)

Unlike the contaminants above, Lead and Copper are rarely in the source water. They enter the water supply through the corrosion of household plumbing, service lines, and fixtures.

  • El Paso 90th Percentile (2024 CCR): Lead (1.16 ppb), Copper (0.476 ppm)
  • Legal Action Level: Lead (15 ppb), Copper (1.3 ppm)
  • Health Guideline: 0 ppb for Lead (No safe level exists).

The "90th Percentile" Explained: The report states that 90% of homes tested had lead levels at or below 1.16 ppb. This implies that 10% of homes had levels higher than this, with some samples reaching up to 6.6 ppb.

Health Risks:

  • Infants & Pregnant Women: Lead crosses the placenta and accumulates in breast milk. There is no known safe level of lead exposure. Even low levels can cause irreversible cognitive delays, lowered IQ, attention deficits, and behavioral issues in children.
  • General Population: Long-term exposure contributes to high blood pressure, kidney damage, and cognitive decline.

Summary of Vulnerable Populations

Pregnant Women

The developing fetus is uniquely vulnerable. Contaminants like Arsenic, Lead, Nitrates, and DBPs can cross the placental barrier, potentially affecting organ development, brain growth, and birth outcomes. Health guidelines suggest that levels considered "legal" for the general population may still pose risks to fetal development.

Infants and Toddlers

  • Higher Exposure: Infants consume more water relative to their body weight than adults.
  • Developing Systems: Their organs and nervous systems are still forming, making them more susceptible to neurotoxins (Lead, Arsenic) and oxygen-blocking agents (Nitrates).
  • Formula Preparation: Mixing formula with tap water concentrates the intake of any dissolved contaminants.

Teens and Adults

While generally more resilient, adults face cumulative risks. Long-term exposure to low levels of carcinogens (Chromium-6, DBPs, Arsenic) increases the statistical probability of developing cancer and chronic diseases later in life.

Recommendations for Consumers

  • Test Your Water: If you live in an older home, consider having your specific plumbing tested for Lead and Copper, as utility reports only reflect the water leaving the treatment plant.
  • Consider Filtration: For households with infants, pregnant women, or those concerned about long-term health, using a filtration system certified to remove the specific contaminants listed above (Arsenic, Lead, Nitrates, DBPs) is a common precautionary measure.
  • Stay Informed: Review the annual Consumer Confidence Report (CCR) sent by your water utility to stay updated on local water quality trends.

Disclaimer: This information is for educational purposes based on public data from the EWG and TCEQ. It is not medical advice. Consult a healthcare provider for specific health concerns.