Drinking water quality · 2024
· Verified
What's in Meridian, ID tap water
25 contaminants were measured in the Meridian, ID water system's 2024 annual report. Each is shown below against its federal limit.
- Reporting year
- 2024
- Contaminants measured
- 25
- Over federal limit
- 0
- Approaching the limit
- 2
- Service area
- ID
PFAS — EPA UCMR5 (2023–2025)
1 PFAS compound above EPA limits in Meridian, ID
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
PFOS (Perfluorooctane sulfonic acid)
● Over EPA limit (1.2×)below national p90 (19.900000000000006 ng/L across detecting U.S. systems)
PFHxS (Perfluorohexane sulfonic acid)
● Below limitbelow national p90 (12.049999999999997 ng/L across detecting U.S. systems)
Lithium
● Detected (no federal limit)above national p90 (76.59999999999991 mg/L across detecting U.S. systems)
Where your water comes from · EPA SDWIS
Meridian, ID's drinking water comes from ground water, drawn from 25 sources.
Source
- WELL · 24
- WELL#21
Treatment
- WELL #11 TREATMENT PLANT
- WELL #12 TREATMENT PLANT
- WELL #14 TREATMENT PLANT
- + 23 more
Distribution
Historical readings · EPA Six-Year Review (2012–2019)
2 contaminants historically over EPA limits in Meridian, ID
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
GROSS ALPHA worst: 2018 | 15.4 pCi/L 1.0× | 15 pCi/L | '12'18'19 |
HAA5 worst: 2017 | 0.06 mg/L 1.0× | 0.06 mg/L | '12'16'17'18'19 |
RADIUM 226 228 worst: 2013 | 4.87 pCi/L 97% near national p90 | 5 pCi/L | '12'13'14'16'19 |
DEHP worst: 2015 | 0.00346 mg/L within | 0.006 mg/L | '15'19 |
NITRATE worst: 2013 | 4.9 mg/L within | 10 mg/L | '12'13'14'15'16'17'18'19 |
ARSENIC worst: 2018 | 0.0044 mg/L within below national p90 | 0.01 mg/L | '14'18'19 |
NITRATE NITRITE worst: 2019 | 3.2 mg/L within | 10 mg/L | '18'19 |
FLUORIDE worst: 2018 | 0.88 mg/L within | 4 mg/L | '12'13'14'16'18'19 |
TTHM worst: 2017 | 0.0139 mg/L within | 0.08 mg/L | '12'13'14'15'16'17'18'19 |
BARIUM worst: 2018 | 0.14 mg/L within near national p90 | 2 mg/L | '12'14'16'18'19 |
ATRAZINE worst: 2019 | 0.000098 mg/L within below national p90 | 0.003 mg/L | '18'19 |
URANIUM worst: 2013 | 0.054 ug/L within 2.5× the national p90 | 30 ug/L | '12'13'14'15'16'17'18'19 |
ETHYLBENZENE worst: 2016 | 0.00053 mg/L within | 0.7 mg/L | '16 |
TOLUENE worst: 2016 | 0.0007 mg/L within | 1 mg/L | '16 |
XYLENES TOTAL worst: 2016 | 0.00295 mg/L within | 10 mg/L | '15'16'17 |
COPPER worst: 2016 | 0.01 mg/L below national p90 | — | '16'17'18'19 |
LEAD worst: 2017 | 0.012 mg/L | — | '17 |
DBAA worst: 2018 | 0.002 mg/L | — | '18'19 |
DCAA worst: 2018 | 0.0014 mg/L | — | '18 |
TCAA worst: 2019 | 0.001 mg/L | — | '19 |
BROMODICHLOROMETHANE worst: 2018 | 0.002 mg/L | — | '18'19 |
BROMOFORM worst: 2018 | 0.0038 mg/L | — | '18'19 |
CHLOROFORM worst: 2018 | 0.0012 mg/L | — | '18'19 |
DIBROMOCHLOROMETHANE worst: 2018 | 0.0035 mg/L | — | '18'19 |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 1.2 mg/LAverageDistribution system | 4 mg/LMRDL | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chromium, TotalTotal chromium — the sum of all chromium forms, from natural deposits and industrial discharge. | 0.0014 mg/LMaximumSystem-wide | 0.1 mg/LMCL | Within the limit |
| CalciumA naturally occurring mineral that contributes to water hardness. | 50.4 mg/LAverageZone 3 | None set | Detected — no federal limit |
+By source (5)— Zone 3, Zone 5, Zone 4 +2 more
| |||
| IronA naturally occurring metal common in groundwater. | 0.23 mg/LAverageZone 1 | None set | Detected — no federal limit |
+By source (5)— Zone 1, Zone 2, Zone 5 +2 more
| |||
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 9.26 mg/LAverageZone 3 | None set | Detected — no federal limit |
+By source (5)— Zone 3, Zone 5, Zone 1 +2 more
| |||
| ManganeseA naturally occurring metal from soil and rock. | 0.02 mg/LAverageZone 4 | None set | Detected — no federal limit |
+By source (5)— Zone 4, Zone 3, Zone 1 +2 more
| |||
| SodiumA naturally occurring salt component. | 79 mg/LAverageZone 5 | None set | Detected — no federal limit |
+By source (5)— Zone 5, Zone 4, Zone 3 +2 more
| |||
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorideA naturally occurring salt compound. | 18.57 mg/LAverageZone 3 | None set | Detected — no federal limit |
+By source (5)— Zone 3, Zone 2, Zone 4 +2 more
| |||
| SulfateA naturally occurring mineral from rock and soil. | 71 mg/LAverageZone 5 | None set | Detected — no federal limit |
+By source (5)— Zone 5, Zone 1, Zone 2 +2 more
| |||
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| HardnessA measure of dissolved calcium and magnesium minerals. | 150 mg/LAverageZone 5 | None set | Detected — no federal limit |
+By source (5)— Zone 5, Zone 3, Zone 2 +2 more
| |||
| pHA measure of how acidic or basic the water is. | 8.08 pHAverageZone 4 | None set | Detected — no federal limit |
+By source (5)— Zone 4, Zone 5, Zone 2 +2 more
| |||
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 360 mg/LAverageZone 5 | None set | Detected — no federal limit |
+By source (5)— Zone 5, Zone 4, Zone 3 +2 more
| |||
People also ask about Meridian, ID's water
+Is Meridian, ID tap water safe to drink in 2024?
Every one of the 25 contaminants measured in Meridian, ID's 2024 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.
+What contaminants are in Meridian, ID tap water?
25 contaminants were measured in Meridian, ID's 2024 Consumer Confidence Report, spanning metals, inorganic chemicals, and physical & aggregate. 12 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Are any contaminants in Meridian, ID tap water approaching the federal limit?
2 contaminants are between 80% and 100% of the federal limit in this report: Uranium and Gross Alpha. Approaching means measured but not in violation — a margin that can close quickly if conditions change.
+Where does the data on this page come from?
Every value is transcribed from Meridian, 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 Meridian, 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.