Meridian Water Dept water quality
Meridian, ID · serves 152,070 people (48,842 connections) · Groundwater · Private · EPA ID ID4010097
Data: U.S. EPA · How we read the data · How we check it
Summary
No federal limits exceeded in EPA data.
- PFAS
- Detected, below limit2 of 29 PFAS found at least once. All averages below the federal limits.
- Lithium
- Above screening levelHighest result 99.5 ppb. EPA uses 10 ppb to decide what to study further. It is not a health limit, and there is no federal limit for lithium. About 1 in 4 systems tested were above it.
- Lead
- Below action level3.9 ppb (parts per billion) at the 90th percentile: 9 in 10 homes sampled were at or below it. Action level 15 ppb, falling to 10 ppb in Nov 2027. Monitoring period ending Jun 2026. Your home's pipes can make yours higher.
- Violations
- None health-basedNo health-based violations since 2016.
- Built before 1986, or not sure what your service line is made of? Check your service line and test your tap. Utility data can't show your pipes.
- Want to reduce what was found? Filters for these results.
- Tested your own tap? Compare your result with these numbers. Moving? Compare this system with another.
- Read Meridian Water Dept's annual water quality report (Consumer Confidence Report). It lists every regulated contaminant tested and is usually on the utility's website or mailed with your bill, and you can also request it at (208) 985-1200. EPA: how to find it.
PFAS (“forever chemicals”)
EPA UCMR 5: 24 entry points tested Sep 2024 to Sep 2025. "Average" is the highest entry-point average (non-detects counted as zero), the way EPA compares UCMR 5 results to the limits. ppt = parts per trillion. These results do not determine compliance.
| Contaminant | Highest average |
|---|---|
| PFOA Not detected Limit 4 ppt | – |
| PFOS One sample above limit Limit 4 ppt | 2.45 ppt 61% of the limit |
| PFHxS Detected, below limit Limit 10 ppt | 3.75 ppt 38% of the limit |
| PFNA Not detected Limit 10 ppt | – |
| HFPO-DA (GenX) Not detected Limit 10 ppt | – |
| Hazard Index (a combined score for PFHxS, PFNA, GenX and PFBS, where above 1 is over the limit) Detected, below limit Limit 1 | 0.38 |
| PFBS Not detected Guideline 2,000 ppt | – |
| PFBA Not detected Guideline 6,000 ppt | – |
| PFHxA Not detected Guideline 3,000 ppt | – |
29 PFAS tested, 2 detected at least once. "Not detected" means below EPA's reporting limit (about 2 to 20 ppt depending on the chemical), not proven zero. PFAS not listed were not detected. The limits for PFHxS, PFNA, GenX and the Hazard Index were proposed for rescission in May 2026. That proposal is not final. Systems have until 2029 to meet the limits.
Lithium
Detected in 36 of 48 samples. Highest result 99.5 ppb. EPA's non-enforceable screening level is 10 ppb. Above screening level The screening level is how EPA decides what to study further, not a health limit. There is no federal limit for lithium and no filter is certified to remove it. About lithium.
Lead and copper
Latest 90th percentile: 3.9 ppb lead (Jan 2026 – Jun 2026). Below action level
Highest since 2016: 9 ppb (Dec 2016).
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jan 2026 – Jun 2026 | 3.9 ppb |
| Jul 2025 – Dec 2025 | 3.6 ppb |
| Jan 2025 – Jun 2025 | 2.5 ppb |
Earlier results (9)
| Jul 2024 – Dec 2024 | 2 ppb |
| Jan 2024 – Jun 2024 | 1.8 ppb |
| Jul 2023 – Dec 2023 | 3.4 ppb |
| Jan 2023 – Jun 2023 | 1.5 ppb |
| Jul 2022 – Dec 2022 | 1.8 ppb |
| Jan 2022 – Jun 2022 | 1.3 ppb |
| Jul 2021 – Dec 2021 | 1 ppb |
| Jan 2021 – Jun 2021 | 1.1 ppb |
| Jul 2020 – Dec 2020 | 1.7 ppb |
Lead comes from pipes and fixtures, not the source water, so it varies home to home. The 90th percentile means 9 in 10 sampled homes were at or below it. More on lead.
Violations
Health-based violations mean a contaminant exceeded a limit or a required treatment step was missed. Monitoring and reporting violations mean required tests or reports were late or missing, so the water's quality during that time is unknown. The total includes every violation in EPA's records, most of them paperwork.
Earlier EPA testing (2013–2020)
| Contaminant | Highest | Guideline |
|---|---|---|
| Manganese | 321 ppb | 300 ppb |
| Vanadium | 8.4 ppb | 21 ppb |
| Molybdenum | 4.6 ppb | 40 ppb |
| Cobalt | 1.7 ppb | 70 ppb |
| Chromium-6 | 0.4 ppb | – |
| Chlorate | 240 ppb | 210 ppb |
| Strontium | 0.72 ppm | 1.5 ppm |
| 1,4-Dioxane | 0.081 ppb | 0.35 ppb |
Where it serves
ZIP codes the system reported serving: 83642, 83646, 83680
Nearby utilities
- Garden City Water and Sewer System Garden City · 6 mi · PFAS above limit
- Capitol Water Corp Boise City · 8 mi · PFAS above limit
- Veolia Water Idaho Boise City · 8 mi
- City of Nampa Nampa · 9 mi
- City of Caldwell Caldwell · 13 mi
- City of Twin Falls Twin Falls · 121 mi
Questions
Is Meridian Water Dept water safe to drink?
Meridian Water Dept has no health-based violations since 2016. EPA testing found no PFAS above the federal limits. Federal data can't tell you about your own pipes: lead comes from service lines and plumbing, so test your tap if your home was built before 1986. For the official word, read the utility's annual Consumer Confidence Report.
Does Meridian Water Dept water have PFAS?
Yes. EPA's 2023–2025 testing of Meridian Water Dept found 2 PFAS at least once. None of the averages were above the federal limits.
What is the lead level in Meridian Water Dept water?
The most recent 90th-percentile lead result for Meridian Water Dept is 3.9 ppb, for the period ending Jun 2026. The federal action level is 15 ppb, falling to 10 ppb in November 2027. The 90th percentile means 9 in 10 homes sampled were at or below this number. Individual homes can be higher.
Check these numbers yourself
Every figure on this page comes from public EPA records. You don't have to take our word for it:
- EPA's own report for ID4010097: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID ID4010097).
- EPA SDWIS download: the lead results, population and violation records we use.
- The utility's annual water quality report (Consumer Confidence Report): ask Meridian Water Dept at (208) 985-1200, or see EPA's guide to finding it.
Found something that doesn't match? Tell us and we'll check it against EPA's records. How we check our data.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.