Well Water in Juniata County: What to Test and Why

Moderate Risk
Testing Recommended 40048 samples analyzed
Top Concerns in This County
Radon Iron

Why This Happens Here

Your well water comes from cracked and folded rock layers that sit beneath Juniata County. These are old shale and sandstone rocks stacked in ridges. Water fills the fractures and cracks in these rocks, creating a natural storage space underground.

Radon forms naturally when uranium trapped in the rock breaks down over time. Iron dissolves from minerals in the shale as groundwater sits in contact with the rock. Arsenic appears at lower levels but comes from the same rock layers. The fractured nature of the bedrock here lets contaminants enter and move through the groundwater.

Your water is very hard and salty, with high sulfate. The hardness comes from minerals in the rock that dissolve slowly as water passes through. You will notice white scale buildup on pipes and water heaters, and rust staining on sinks and laundry. The high sulfate can give water a bitter taste and may affect sensitive stomach conditions.

What This Means for You

Radon and iron both exceed EPA health standards in Juniata County wells. Radon is a radioactive gas that comes from natural rock decay. Iron dissolves into groundwater from bedrock minerals. Both contaminants show up at levels that warrant testing and possible treatment.

Long-term exposure to radon increases lung cancer risk, especially when the gas is released during showers and hot water use. High iron causes orange-red staining on sinks, toilets, and laundry. The water here is also extremely hard and has high sulfate, which leaves crusty buildup on pipes and water heaters and can give water a bitter taste.

Get your well tested by a state-certified lab right away. A basic health screen for bacteria and nitrate runs $50–100. A comprehensive metals and radon panel runs $200–400 and should include iron, arsenic, radon, and other minerals. A whole-house treatment system combining radon removal and iron filtration can address your main concerns.

Contaminant Detection Data

Contaminant Samples % Above MCL Distribution Confidence Risk
Radon 10 50% 30% · 20% · 50% Low High
Iron 4 33% 75% · 0% · 25% Low High
Fluoride 2 0% 100% · 0% · 0% Low Low
Arsenic 6 0% 83% · 17% · 0% Low Low
Sulfate 33 0% 100% · 0% · 0% Moderate Low
Chloride 42 0% 100% · 0% · 0% Moderate Low
Lead 17 0% 100% · 0% · 0% Moderate Low
Nitrate 34 0% 94% · 6% · 0% Moderate Low
Nitrite 5 0% 100% · 0% · 0% Low Low
Uranium 3 0% 100% · 0% · 0% Low Low
Hardness 9 Low Low
Manganese 1 0% 100% · 0% · 0% Low Safe
Fecal Coliform 1 Low Safe
Total Coliform 1 0% 100% · 0% · 0% Low Safe
E. coli 1 0% 100% · 0% · 0% Low Safe
pH 7 Low Low
Sodium 41 Moderate Low

MCL = Maximum Contaminant Level (EPA limit for public water; used as benchmark for private wells). Distribution shows % of sampled wells in each concentration band. Methodology.

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