Drinking water quality · 2024
· Verified
What's in Tracy, CA tap water
52 contaminants were measured in the Tracy, CA water system's 2024 annual report. Each is shown below against its federal limit.
- Reporting year
- 2024
- Contaminants measured
- 52
- Over federal limit
- 0
- Approaching the limit
- 1
- Service area
- CA
state-level CCR
Approaching the limit (≥ 80%)
PFAS — EPA UCMR5 (2023–2025)
1 PFAS compound detected in Tracy, CA
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.
Lithium
● Detected (no federal limit)Measured 28.5 mg/LSample year 2025Samples 2 detect / 2
below national p90 (76.59999999999991 mg/L across detecting U.S. systems)
PWSID CA3910011 · Source: EPA UCMR5. Limits per EPA's April 2024 PFAS National Primary Drinking Water Regulation. PFAS values reported in nanograms per liter (ng/L) — note that 1 ng/L = 1 part per trillion.
Where your water comes from · EPA SDWIS
Tracy, CA's drinking water comes from ground water, drawn from 10 sources.
Source
10ground water
- PRODUCTION · 8
- WELL 04R - NEW LINCOLN PARK WELL
- DMC - RAW
Treatment
9treatment plants
- PRODUCTION WELL 01 - TREATED
- PRODUCTION WELL 05 - TREATED
- PRODUCTION WELL 06 - TREATED
- + 6 more
Distribution
0storage units
Also buys water from SOUTH SAN JOAQUIN IRRIGATION DISTRICT.
Source: EPA SDWIS facilities inventory. Methodology.
Historical readings · EPA Six-Year Review (2012–2019)
1 contaminant historically over EPA limits in Tracy, CA
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: 2015 | 0.12 mg/L 1.5× | 0.08 mg/L | '12'13'14'15'16'17'18'19 |
HAA5 worst: 2019 | 0.05 mg/L 83% | 0.06 mg/L | '12'13'14'15'16'17'18'19 |
ARSENIC worst: 2014 | 0.0056 mg/L within below national p90 | 0.01 mg/L | '12'13'14'15'16'17'18 |
NITRATE worst: 2019 | 3.6 mg/L within | 10 mg/L | '12'13'14'15'16'17'18'19 |
NITRATE NITRITE worst: 2019 | 3.6 mg/L within | 10 mg/L | '16'17'18'19 |
DICHLOROMETHANE worst: 2017 | 0.0014 mg/L within | 0.005 mg/L | '12'13'16'17 |
FLUORIDE worst: 2016 | 0.3 mg/L within | 4 mg/L | '12'13'14'15'16'17'18 |
URANIUM worst: 2016 | 0.00238 ug/L within below national p90 | 30 ug/L | '14'16 |
TCAA worst: 2012 | 0.0078 mg/L | — | '12'13'14'15'16'17'18'19 |
DBAA worst: 2012 | 0.0057 mg/L | — | '12'13'14'15'16'17'18'19 |
DCAA worst: 2012 | 0.013 mg/L | — | '12'13'14'15'16'17'18'19 |
MBAA worst: 2014 | 0.001 mg/L | — | '14'19 |
MCAA worst: 2019 | 0.0021 mg/L | — | '19 |
BROMODICHLOROMETHANE worst: 2012 | 0.016 mg/L | — | '12'13'14'15'16'17'18'19 |
BROMOFORM worst: 2012 | 0.016 mg/L | — | '12'13'14'15'16'17'18'19 |
CHLOROFORM worst: 2012 | 0.022 mg/L | — | '12'13'14'15'16'17'18'19 |
DIBROMOCHLOROMETHANE worst: 2012 | 0.028 mg/L | — | '12'13'14'15'16'17'18'19 |
PWSID CA3910011 · Source: EPA Six-Year Review 4 (2012–2019). Values are the highest detection in each calendar year; non-detect years are omitted. Year tags above show every year with a detection.
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 668 mg/LAverageAgua De Pozo Promedio | 1000 mg/LMCL | Within the limit |
+By source (5)— Fecha De Muestra, Planta De Tratamiento De Agua John Jones, John Jones Water Treatment Plant +2 more
| |||
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 1039 uS/cmAverageAgua De Pozo Promedio | 1600 uS/cmMCL | Within the limit |
+By source (5)— Fecha De Muestra, John Jones Water Treatment Plant, Planta De Tratamiento De Agua John Jones +2 more
| |||
| ColorA measure of visible tint in the water. | 2.67AverageSystem-wide | 15MCL | Within the limit |
+By source (5)— Fecha De Muestra, John Jones Water Treatment Plant, Planta De Tratamiento De Agua John Jones +2 more
| |||
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.73 NTUAverageAgua De Pozo Promedio | 5 NTUMCL | Within the limit |
+By source (2)— Distrito De Riego Del Sur De San JoaquíN, South San Joaquin Irrigation District
| |||
| OdorA measure of detectable smell in the water. | 0.11AverageSystem-wide | 3MCL | Within the limit |
+By source (3)— Fecha De Muestra, South San Joaquin Irrigation District, Distrito De Riego Del Sur De San JoaquíN
| |||
| HardnessA measure of dissolved calcium and magnesium minerals. | 264 mg/LAverageAgua De Pozo Promedio | None set | Detected — no federal limit |
+By source (3)— Fecha De Muestra, Distrito De Riego Del Sur De San JoaquíN, South San Joaquin Irrigation District
| |||
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| SulfateA naturally occurring mineral from rock and soil. | 221 mg/LAverageSystem-wide | 500 mg/LMCL | Within the limit |
+By source (5)— Fecha De Muestra, Planta De Tratamiento De Agua John Jones, John Jones Water Treatment Plant +2 more
| |||
| ChlorideA naturally occurring salt compound. | 114 mg/LAverageAgua De Pozo Promedio | 500 mg/LMCL | Within the limit |
+By source (5)— Fecha De Muestra, John Jones Water Treatment Plant, Planta De Tratamiento De Agua John Jones +2 more
| |||
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chromium, TotalTotal chromium — the sum of all chromium forms, from natural deposits and industrial discharge. | 3.55 ug/LAverageSystem-wide | 10 ug/LMCL | Within the limit |
+By source (5)— Fecha De Muestra, South San Joaquin Irrigation District, Planta De Tratamiento De Agua John Jones +2 more
| |||
| CopperA metal that enters water from corroding household plumbing. | 0.396 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
+By source (2)— Fecha De Muestreo, Nivel Detectado En El Percentil 90
| |||
| ManganeseA naturally occurring metal from soil and rock. | 13 ug/LAverageAgua De Pozo Promedio | 50 ug/LMCL | Within the limit |
+By source (5)— Fecha De Muestra, John Jones Water Treatment Plant, Distrito De Riego Del Sur De San JoaquíN +2 more
| |||
| BoronA naturally occurring element from rock and soil. | 1.6 mg/LAverageSystem-wide | 10 mg/LMCL | Within the limit |
+By source (5)— Fecha De Muestra, Planta De Tratamiento De Agua John Jones, John Jones Water Treatment Plant +2 more
| |||
| IronA naturally occurring metal common in groundwater. | 45 ug/LAverageSystem-wide | 300 ug/LMCL | Within the limit |
+By source (5)— Fecha De Muestra, Planta De Tratamiento De Agua John Jones, John Jones Water Treatment Plant +2 more
| |||
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 0 mg/L90th percentileAt the tap | 0.015 mg/LAction level | Within the limit |
+By source (2)— Fecha De Muestreo, Nivel Detectado En El Percentil 90
| |||
| SodiumA naturally occurring salt component. | 119 mg/LAverageAgua De Pozo Promedio | None set | Detected — no federal limit |
+By source (3)— Fecha De Muestra, South San Joaquin Irrigation District, Distrito De Riego Del Sur De San JoaquíN
| |||
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 0.33 pCi/LAverageSystem-wide | 15 pCi/LMCL | Within the limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | Not detectedRunning annual avgSystem-wide | 5MCL | None detected |
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid, a chlorinated PFAS compound. | Not detectedRunning annual avgSystem-wide | 0.005MCL | None detected |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)ADONA, a newer-generation PFAS replacement compound. | Not detectedRangeSystem-wide | 0.003MCL | None detected |
| 4:2 Fluorotelomer sulfonic acid (4:2 FTS)4:2 fluorotelomer sulfonic acid, a PFAS-related compound. | Not detectedRangeSystem-wide | 0.003MCL | None detected |
| 6:2 Fluorotelomer sulfonic acid (6:2 FTS)6:2 fluorotelomer sulfonic acid, a PFAS-related compound. | Not detectedRangeSystem-wide | 0.005MCL | None detected |
| 8:2 Fluorotelomer sulfonic acid (8:2 FTS)8:2 fluorotelomer sulfonic acid, a PFAS-related compound. | Not detectedRangeSystem-wide | 0.005MCL | None detected |
| 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS)9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid, a chlorinated PFAS compound. | Not detectedRunning annual avgSystem-wide | 0.002MCL | None detected |
| Hexafluoropropylene oxide dimer acidHFPO-DA ('GenX chemicals'), a newer-generation PFAS replacement compound. | Not detectedRangeSystem-wide | 0.005MCL | None detected |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)N-ethyl perfluorooctanesulfonamidoacetic acid, a PFAS-related compound. | Not detectedRangeSystem-wide | 0.005MCL | None detected |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)N-methyl perfluorooctanesulfonamidoacetic acid, a PFAS-related compound. | Not detectedRunning annual avgSystem-wide | 0.006MCL | None detected |
| Nonafluoro-3,6-dioxaheptanoic acidNonafluoro-3,6-dioxaheptanoic acid, a PFAS-related compound. | Not detectedRunning annual avgSystem-wide | 0.02MCL | None detected |
| Perfluoro-3-methoxypropanoic acid (PFMPA)Perfluoro-3-methoxypropanoic acid, a PFAS-related compound. | Not detectedRangeSystem-wide | 0.004MCL | None detected |
| Perfluoro-4-methoxybutanoic acid (PFMBA)Perfluoro-4-methoxybutanoic acid, a PFAS-related compound. | Not detectedRunning annual avgSystem-wide | 0.003MCL | None detected |
| Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA)Perfluoro(2-ethoxyethane)sulfonic acid, a PFAS-related compound. | Not detectedRangeSystem-wide | 0.003MCL | None detected |
| Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' | Not detectedRunning annual avgSystem-wide | 0.003MCL | None detected |
| Perfluorodecanoic acid (PFDA)Perfluorodecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detectedRunning annual avgSystem-wide | 0.003MCL | None detected |
| Perfluorododecanoic acid (PFDoA)Perfluorododecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detectedRunning annual avgSystem-wide | 0.003MCL | None detected |
| Perfluoroheptanesulfonic acid (PFHpS)Perfluoroheptanesulfonic acid, a PFAS 'forever chemical.' | Not detectedRunning annual avgSystem-wide | 0.003MCL | None detected |
| Perfluoroheptanoic acidPerfluoroheptanoic acid, a PFAS 'forever chemical.' | Not detectedRangeSystem-wide | 0.003MCL | None detected |
| Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.' | Not detectedRunning annual avgSystem-wide | 0.003MCL | None detected |
| Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.' | Not detectedRangeSystem-wide | 0.003MCL | None detected |
| Perfluorononanoic acidPerfluorononanoic acid, a PFAS 'forever chemical.' | Not detectedRangeSystem-wide | 0.004MCL | None detected |
| Perfluoropentanesulfonic acid (PFPeS)Perfluoropentanesulfonic acid, a PFAS 'forever chemical.' | Not detectedRunning annual avgSystem-wide | 0.004MCL | None detected |
| Perfluoropentanoic acidPerfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.' | Not detectedRunning annual avgSystem-wide | 0.003MCL | None detected |
| Perfluorotetradecanoic acid (PFTeDA)Perfluorotetradecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detectedRangeSystem-wide | 0.008MCL | None detected |
| Perfluorotridecanoic acid (PFTrDA)Perfluorotridecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detectedRangeSystem-wide | 0.007MCL | None detected |
| Perfluoroundecanoic acid (PFUnA)Perfluoroundecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detectedRunning annual avgSystem-wide | 0.002MCL | None detected |
| PFBAPerfluorobutanoic acid, a shorter-chain PFAS 'forever chemical.' | Not detectedRunning annual avgSystem-wide | 0.005MCL | None detected |
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | Not detectedRunning annual avgSystem-wide | 0.004MCL | None detected |
| PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. | Not detectedRangeSystem-wide | 0.004MCL | None detected |
Source: Tracy, CA's 2024 Consumer Confidence Report — the annual drinking-water report every U.S. utility is required to publish. The numbers on this page are the utility's own. A water-quality report covers an entire service area, not a single address.
People also ask about Tracy, CA's water
+Is Tracy, CA tap water safe to drink in 2024?
Every one of the 52 contaminants measured in Tracy, CA'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 Tracy, CA tap water?
52 contaminants were measured in Tracy, CA's 2024 Consumer Confidence Report, spanning pfas ("forever chemicals"), metals, and physical & aggregate. 50 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 Tracy, CA tap water approaching the federal limit?
One contaminant is between 80% and 100% of the federal limit in this report: Lithium. 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 Tracy, CA'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 Tracy, CA'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.
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