Tap Water Quality Report
Tap water quality in LINCOLN, California
Tap water in LINCOLN, California receives a grade of C (74/100) from TapWaterSafety.org. It's served by CITY OF LINCOLN. The most significant water quality concerns are: Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in LINCOLN's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving LINCOLN.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 2.8 ppt, 2800x above the EWG health guideline of 0.001 ppt.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 31.1 ppb, 519x above the EWG health guideline of 0.06 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 36.2 ppb, 362x above the EWG health guideline of 0.1 ppb.
EPA compliance record
Official U.S. EPA records for CITY OF LINCOLN (system ID CA3110004) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for LINCOLN
Filters matched to the specific contaminants in LINCOLN's water supply.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in LINCOLN's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Perfluorohexane sulfonate (PFHXS) PFAS |
2.8 ppt | 0.001 | 10.0 | — | — | — | — | 2800× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
31.1 ppb | 0.06 | — | — | — | — | — | 519× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
38.2 ppb | 0.15 | 80.0 | 100 | — | — | — | 255× over |
| Trichloroacetic acid Disinfection byproduct |
13.0 ppb | 0.1 | — | — | — | — | — | 130× over |
| Chloroform Disinfection byproduct |
35.5 ppb | 0.4 | — | — | — | — | — | 89× over |
| Dichloroacetic acid Disinfection byproduct |
11.8 ppb | 0.2 | — | — | — | — | — | 59× over |
| Bromodichloromethane Disinfection byproduct |
2.49 ppb | 0.06 | — | — | — | — | — | 42× over |
| Chromium (hexavalent) Heavy metal |
0.844 ppb | 0.02 | — | — | — | — | — | 42× over |
| Nitrate Inorganic |
2.49 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 18× over |
| Nitrate and nitrite Inorganic |
2.43 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 17× over |
| Dibromochloromethane Disinfection byproduct |
0.127 ppb | 0.1 | — | — | — | — | — | 1.3× over |
| Chlorate Disinfection byproduct |
180.7 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
4.95 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
35.3 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Bromoform Disinfection byproduct |
0.0222 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Aluminum* Heavy metal |
8.54 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Selenium* Heavy metal |
0.408 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Manganese Heavy metal |
1.08 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monobromoacetic acid* Disinfection byproduct |
0.0298 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0752 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.273 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from CITY OF LINCOLN.