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
- 1
- 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)below national p90 (13.909999999999979 ng/L across detecting U.S. systems)
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.
Historical readings · EPA Six-Year Review (2012–2019)
13 historically-detected contaminants in Renton, WA
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) |
|---|---|---|---|
TTHM worst: 2012 | 0.0214 mg/L within | 0.08 mg/L | '12'13'14'15'16'17'18'19 |
NITRATE worst: 2014 | 2.2 mg/L within | 10 mg/L | '12'13'14'15'16'17'18'19 |
NITRATE NITRITE worst: 2019 | 2.09 mg/L within | 10 mg/L | '19 |
FLUORIDE worst: 2019 | 0.72 mg/L within | 4 mg/L | '16'19 |
ARSENIC worst: 2019 | 0.0014 mg/L within below national p90 | 0.01 mg/L | '19 |
HAA5 worst: 2012 | 0.0077 mg/L within | 0.06 mg/L | '12'13'14'15'16'17'18'19 |
COPPER worst: 2016 | 0.02 mg/L below national p90 | — | '16 |
DCAA worst: 2012 | 0.0034 mg/L | — | '12'13'14'15'16'17'18'19 |
TCAA worst: 2012 | 0.0043 mg/L | — | '12'13'14'15'16'17'18'19 |
BROMODICHLOROMETHANE worst: 2012 | 0.0057 mg/L | — | '12'13'14'15'16'17'18'19 |
BROMOFORM worst: 2012 | 0.0009 mg/L | — | '12'13'14'16 |
CHLOROFORM worst: 2012 | 0.0136 mg/L | — | '12'13'14'15'16'17'18'19 |
DIBROMOCHLOROMETHANE worst: 2012 | 0.0029 mg/L | — | '12'13'14'15'16'17'18'19 |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 1–1.5 mg/LAverageSystem-wide | 4 mg/LMCL | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 0–5.1 ug/L90th percentileAt the tap | 15 ug/LAction level | Within the limit |
| BariumA metal from erosion of natural deposits and industrial discharge. | 1.5 ug/LAverageCedar Water | 2000 ug/LMCL | 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. | 18–18 mg/LReported levelSystem-wide | None set | Detected — no federal limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| BromateA disinfection byproduct formed when bromide-containing water is treated with ozone. | 0.7 ug/LAverageCedar Water | 10 ug/LMCL | Within the limit |
+By source (2)— Cedar Water, Tolt Water
| |||
Inorganic chemicals
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| 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
| |||
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.38 NTUAverageCedar Water | None set | Detected — no federal limit |
+By source (2)— Cedar Water, Tolt Water
| |||
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. 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.
+Are any contaminants in Renton, WA tap water approaching the federal limit?
One contaminant is between 80% and 100% of the federal limit in this report: Perfluorobutanesulfonic acid. 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 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.