Drinking water quality · 2024
What's in Nampa, ID tap water
14 contaminants were measured in the Nampa, ID water system's 2024 annual report. Each is shown below against its federal limit — 1 sit at or above that limit.
- Reporting year
- 2024
- Contaminants measured
- 14
- Over federal limit
- 1
- Approaching the limit
- 0
- Worst contaminant
- Gross Alpha
- Service area
- ID
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 16 pCi/LMaximumSystem-wide | 0 pCi/LMCLG | At or above the limit |
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 18 ug/LMaximumSystem-wide | 0 ug/LMCLG | Within the limit |
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | 1.35 pCi/LMaximumSystem-wide | 0 pCi/LMCLG | Within the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 6.3 mg/LMaximumSystem-wide | 10 mg/LMCLG | Within the limit |
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 1.34 mg/LMaximumSystem-wide | 4 mg/LMCLG | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 6.1 ug/LMaximumSystem-wide | 0 ug/LMCLG | Within the limit |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 2 ug/LHighest single sampleAt the tap | 0 ug/LMCLG | Within the limit |
| CopperA metal that enters water from corroding household plumbing. | 0.096 mg/LHighest single sampleAt the tap | 1.3 mg/LMCLG | Within the limit |
| BariumA metal from erosion of natural deposits and industrial discharge. | 0.06 mg/LMaximumSystem-wide | 2 mg/LMCLG | Within the limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 0.53 mg/LMaximumSystem-wide | 4 mg/LMCLG | Within the limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 7.63 ug/LMaximumSystem-wide | None set | Within the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 2.57 ug/LMaximumSystem-wide | None set | Within the limit |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chromium | Not detected mg/LMaximumSystem-wide | None set | None detected |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 1 %RangeSystem-wide | 0 %MCLG | Detected — no federal limit |
People also ask about Nampa, ID's water
+Is Nampa, ID tap water safe to drink in 2024?
The 2024 Consumer Confidence Report for the Nampa, ID water utility lists 1 contaminant at or above the federal limit: Gross Alpha. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in Nampa, ID tap water?
14 contaminants were measured in Nampa, ID's 2024 Consumer Confidence Report, spanning metals, radionuclides, and disinfection byproducts. 11 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in Nampa, ID tap water?
One contaminant in Nampa, ID's 2024 report sits at or above the federal limit: Gross Alpha (1.1× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in Nampa, ID tap water?
The contaminant with the highest measured value relative to its federal limit in the 2024 report is Gross Alpha, at 1.1× the federal threshold. It belongs to the radionuclides family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Nampa, ID's 2024 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Nampa, ID's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2024 report; a new report will replace it once the utility publishes its next annual update.