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Nampa City Of

Nampa, ID · serves 100,200 · GroundwaterID3140080
Worth watching
Naturally occurring lithium detected. No federal limit. Research is preliminary; see the lithium learn page for context.
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Measured in your 2022 water report
From your utility's Consumer Confidence Report · 9 contaminants tested
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Contaminants detected above federal limits
Your utility's own 2022 water report disclosed the following levels. Utilities have until 2029 to comply with new federal limits.
ContaminantDetected LevelFederal LimitHow Far Over
Uranium32 µg/L30 µg/L~1.1× the limit
Above limit
Approaching limit
Within limits
Regulated contaminants — legally enforceable limits
Arsenic▸
0.0068 mg/L
What is it?
A naturally occurring element found in rock and soil. Gets into drinking water through erosion of natural deposits or runoff from industrial and agricultural sources.
Why it matters
Long-term exposure is linked to increased risk of skin, bladder, and lung cancer. There is no safe level for arsenic — the MCL of 10 µg/L balances health protection with treatment feasibility.
What to do
If your water is near or above the limit, a reverse osmosis filter certified to NSF/ANSI 58 removes over 90% of arsenic. Point-of-use filters at the kitchen tap are effective and affordable.
What the research says
Multiple peer-reviewed studies have found congenital heart defects including atrial septal defects at concentrations as low as 0.0005 mg/L — 20x below the US federal limit.
Barium▸
0.09 mg/L
What is it?
A naturally occurring metal found in mineral deposits. Enters water through erosion of natural deposits or discharge from drilling and metal refining operations.
Why it matters
At high levels, barium can cause increased blood pressure. Levels well below the MCL of 2 mg/L are not a health concern.
What to do
No action needed at typical detection levels. Barium is rarely found near its MCL in treated drinking water.
Combined Radium▸
1.35 pCi/L
What is it?
The combined measurement of radium-226 and radium-228 — naturally occurring radioactive elements found in some groundwater, especially in the Midwest and Great Plains.
Why it matters
Long-term exposure above the MCL of 5 pCi/L increases cancer risk, particularly bone cancer. Radium is most common in deep groundwater wells.
What to do
Ion exchange water softeners can reduce radium. Reverse osmosis is also effective. If your system uses groundwater and radium is detected, a point-of-use filter adds a layer of protection.
Fluoride▸
0.47 mg/L
What is it?
Naturally occurring mineral, also added to many water systems to prevent tooth decay. The MCL (4 mg/L) is much higher than the typical added amount (0.7 mg/L).
Why it matters
At levels near the MCL, long-term exposure can cause skeletal fluorosis (bone pain and tenderness). The secondary standard of 2 mg/L triggers a required public notice about dental fluorosis risk in children.
What to do
Levels below 2 mg/L are within the range considered safe. If above 2 mg/L, children under 9 may be at risk for dental fluorosis — talk to your pediatric dentist.
What the research says
Multiple peer-reviewed studies have found lower IQ in children and potential thyroid disruption at concentrations as low as 1.5 mg/L — 3x below the US federal limit.
Nitrate (as N)▸
6.4 mg/L
What is it?
Comes from fertilizer runoff, septic systems, and erosion of natural deposits. One of the most common groundwater contaminants in agricultural areas.
Why it matters
Nitrate above 10 mg/L can cause "blue baby syndrome" (methemoglobinemia) in infants under 6 months — it interferes with blood's ability to carry oxygen. Adults can tolerate higher levels.
What to do
If you have an infant on formula and your water is above 5 mg/L, consider using bottled water for formula preparation. Boiling water does NOT remove nitrate — it concentrates it.
What the research says
Multiple peer-reviewed studies have found neural tube defects, preterm birth, and low birth weight at concentrations as low as 5 mg/L — 2x below the US federal limit.
Uranium▸
32 µg/L ×1.1
What is it?
A naturally occurring radioactive metal found in some groundwater, especially in granite and volcanic rock formations. Common in the western US.
Why it matters
The MCL of 20 pCi/L (or 0.030 mg/L) protects against kidney toxicity and cancer risk. Uranium is both a chemical toxin and a radiological hazard.
What to do
Reverse osmosis and ion exchange filters can reduce uranium. If your system uses groundwater in a uranium-bearing geology, a point-of-use filter is good protection.
Lead & copper — tested at your tap
Copper▸
0.8 mg/L
What is it?
Leaches from copper household plumbing and pipes. Some copper is a normal part of drinking water infrastructure.
Why it matters
Short-term exposure above the action level of 1.3 mg/L can cause gastrointestinal distress. Long-term exposure can cause liver and kidney damage. At typical detected levels (well below the AL), copper is not a health concern.
What to do
If above the action level, run your tap for 30 seconds before drinking. Copper levels decrease as water flows through the pipes.
% of limit

CCR data in early access — values are extracted from utility PDFs and may contain errors. Verify with your utility's 2022 CCR report.

Flagged for review
The following measurements were extracted from this system's Consumer Confidence Report but have been flagged for verification. These values are likely extraction or unit errors and have been removed from the chart above.
ContaminantReported ValueLimitReason
Chromium4 mg/L0.1 mg/LValue 4 mg/L exceeds sanity limit (1) — possible unit or extraction error
Think this data is correct?
Source: NAMPA CITY OF Consumer Confidence Report 2022 · Extracted by WaterScore
Measured data
Private Well Risk

Do you have or use a private well? Measured concentrations from nearby private wells sampled within 5 miles.

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16 wells
Water Sources

Nampa pumps water from 16 groundwater wells drawing from the Snake River Plain basin-fill aquifers. Emergency backup sources are available if primary supplies are disrupted.

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Spatial context
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