Drinking water quality · 2024
· Verified
What's in Renton, WA tap water
20 contaminants were measured in the Renton, WA water system's 2024 annual report. Each is shown below against its federal limit.
- Reporting year
- 2024
- Contaminants measured
- 20
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- WA
PFAS — EPA UCMR5 (2023–2025)
1 PFAS compound detected in Renton, WA
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.
PFBS
● Detected (no federal limit)Where your water comes from · EPA SDWIS
Renton, WA's drinking water comes from ground water, drawn from 14 sources.
Source
- WELL 9 PW-9
- WELL 11 PW-11
- WELL 17 PW-17
- WELL 12 PW-12
- + 10 more
Treatment
- Well # 8 Disinfection
- Corrosion Control Treatment Plant
- Well #9 Disinfection
- + 6 more
Distribution
Also buys water from SEATTLE PUBLIC UTILITIES, TUKWILA WATER DEPARTMENT, and 2 more.
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | 0.03–0.69 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 0–5.1 ug/L90th percentileAt the tap | None set | Within the limit |
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 0.4 ug/LAverageCedar Water | None set | Within the limit |
+By source (2)— Cedar Water, Tolt Water
| |||
| BariumA metal from erosion of natural deposits and industrial discharge. | 1.5 ug/LAverageCedar Water | None set | Within the limit |
+By source (2)— Cedar Water, Tolt Water
| |||
| CalciumA naturally occurring mineral that contributes to water hardness. | 13Reported levelDowntown Wells | None set | Detected — no federal limit |
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 3.5Reported levelDowntown Wells | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 14–18 mg/LReported levelSystem-wide | None set | Detected — no federal limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.38 NTUAverageCedar Water | None set | Within the limit |
+By source (2)— Cedar Water, Tolt Water
| |||
| HardnessA measure of dissolved calcium and magnesium minerals. | 44Reported levelDowntown Wells | None set | Detected — no federal limit |
| pHA measure of how acidic or basic the water is. | 7.4–8Reported levelDowntown Wells | None set | Detected — no federal limit |
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 1.26 mg/LAverageTolt Water | None set | Detected — no federal limit |
+By source (2)— Tolt Water, Cedar Water
| |||
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 0.6–1.5 mg/LAverageSystem-wide | 4 mg/LMCL | 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. | 6.8–15 ug/LAverageSystem-wide | None set | Within the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 2.6–6.5 ug/LAverageSystem-wide | None set | Within the limit |
| BromateA disinfection byproduct formed when bromide-containing water is treated with ozone. | 0.7 ug/LAverageCedar Water | None set | Within the limit |
+By source (2)— Cedar Water, Tolt Water
| |||
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.7 mg/LAverageCedar Water | 4 mg/LMCL | Within the limit |
+By source (2)— Cedar Water, Tolt Water
| |||
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 0.1 mg/LAverageCedar Water | 10 mg/LMCL | Within the limit |
+By source (2)— Cedar Water, Tolt Water
| |||
| ChlorideA naturally occurring salt compound. | 3.5 mg/LReported levelDowntown Wells | None set | Detected — no federal limit |
| SulfateA naturally occurring mineral from rock and soil. | 4.9 mg/LReported levelDowntown Wells | None set | Detected — no federal limit |
People also ask about Renton, WA's water
+Is Renton, WA tap water safe to drink in 2024?
Every one of the 20 contaminants measured in Renton, WA'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 Renton, WA tap water?
20 contaminants were measured in Renton, WA's 2024 Consumer Confidence Report, spanning metals, inorganic chemicals, and physical & aggregate. 4 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Where does the data on this page come from?
Every value is transcribed from Renton, WA'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 Renton, WA'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.