Drinking water quality · 2023
· Verified
What's in City of Lathrop — Lathrop, Ca, CA tap water
31 contaminants were measured in the City of Lathrop — Lathrop, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit — 2 sit at or above that limit.
- Reporting year
- 2023
- Contaminants measured
- 31
- Over federal limit
- 2
- Approaching the limit
- 1
- Worst contaminant
- PFOS
- Service area
- CA
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. | 0–23 ng/LRangeCity Wells-Raw GW | None set | At or above the limit |
+By source (2)— City Wells-Raw GW, Distribution System (Combined GW and SW)
| |||
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | 3 ng/LReported levelCity Wells-Raw GW | None set | Within the limit |
| Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.' | 0–4.7 ng/LRangeCity Wells-Raw GW | None set | Within the limit |
+By source (2)— City Wells-Raw GW, Distribution System (Combined GW and SW)
| |||
| Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' | 0–7.5 ng/LRangeCity Wells-Raw GW | None set | Detected — no federal limit |
+By source (2)— City Wells-Raw GW, Distribution System (Combined GW and SW)
| |||
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 6–12 ug/LRangeLAWTF-Treated GW | None set | At or above the limit |
| BariumA metal from erosion of natural deposits and industrial discharge. | 0.4 mg/LReported levelCity Wells-Raw GW | 2 mg/LMCL | Within the limit |
| Chromium, TotalTotal chromium — the sum of all chromium forms, from natural deposits and industrial discharge. | 12 ug/LReported levelCity Wells-Raw GW | None set | Within the limit |
| CopperA metal that enters water from corroding household plumbing. | 0.13 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| CalciumA naturally occurring mineral that contributes to water hardness. | 46–70 mg/LRangeCity Wells-Raw GW | None set | Detected — no federal limit |
+By source (2)— City Wells-Raw GW, SSJID-Treated SW
| |||
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 11–16 mg/LRangeCity Wells-Raw GW | None set | Detected — no federal limit |
+By source (2)— City Wells-Raw GW, SSJID-Treated SW
| |||
| SodiumA naturally occurring salt component. | 40–50 mg/LRangeCity Wells-Raw GW | None set | Detected — no federal limit |
+By source (2)— City Wells-Raw GW, SSJID-Treated SW
| |||
| Vanadium | 14 ug/LReported levelCity Wells-Raw GW | None set | Detected — no federal limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 22–51 ug/LRangeDistribution System (Combined GW and SW) | None set | Approaching the limit |
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 22–51 ug/LRangeDistribution System (Combined GW and SW) | None set | Within the limit |
| BromodichloromethaneA trihalomethane disinfection byproduct. | 2–5 ug/LRangeDistribution System (Combined GW and SW) | None set | Detected — no federal limit |
| BromoformA trihalomethane disinfection byproduct. | 0–8 ug/LRangeDistribution System (Combined GW and SW) | None set | Detected — no federal limit |
| ChloroformA trihalomethane formed when chlorine reacts with organic matter in water. | 7–49 ug/LRangeDistribution System (Combined GW and SW) | None set | Detected — no federal limit |
| DibromochloromethaneA trihalomethane disinfection byproduct. | 0–7 ug/LRangeDistribution System (Combined GW and SW) | None set | Detected — no federal limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 3.7–8.3 pCi/LRangeCity Wells-Raw GW | 15 pCi/LMCL | Within the limit |
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | 0.8 pCi/LReported levelCity Wells-Raw GW | 5 pCi/LMCL | Within the limit |
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 2.1–6.4 pCi/LRangeCity Wells-Raw GW | 20 pCi/LMCL | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 2.6–5.2 mg/LRangeCity Wells-Raw GW | 10 mg/LMCL | Within the limit |
| Dichloroacetic acidA haloacetic acid disinfection byproduct. | 6–22 ug/LRangeDistribution System (Combined GW and SW) | None set | Within the limit |
| Trichloroacetic acidA haloacetic acid disinfection byproduct. | 6–21 ug/LRangeDistribution System (Combined GW and SW) | None set | Within the limit |
| Dibromoacetic acidA brominated haloacetic acid disinfection byproduct. | 0–5 ug/LRangeDistribution System (Combined GW and SW) | None set | Within the limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 0.2–1.2 mg/LRangeDistribution System (Combined GW and SW) | None set | Within the limit |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Mcaa | 0–4 ug/LRangeDistribution System (Combined GW and SW) | None set | Detected — no federal limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| AlkalinityA measure of the water's capacity to neutralize acids. | 200–210 mg/LRangeCity Wells-Raw GW | None set | Detected — no federal limit |
+By source (2)— City Wells-Raw GW, SSJID-Treated SW
| |||
| Bicarbonate | 250 mg/LReported levelCity Wells-Raw GW | None set | Detected — no federal limit |
+By source (2)— City Wells-Raw GW, SSJID-Treated SW
| |||
| HardnessA measure of dissolved calcium and magnesium minerals. | 164–240 mg/LRangeCity Wells-Raw GW | None set | Detected — no federal limit |
+By source (2)— City Wells-Raw GW, SSJID-Treated SW
| |||
| pHA measure of how acidic or basic the water is. | 8Reported levelSSJID-Treated SW | None set | Detected — no federal limit |
+By source (2)— SSJID-Treated SW, City Wells-Raw GW
| |||
People also ask about City of Lathrop — Lathrop, Ca, CA's water
+Is City of Lathrop — Lathrop, Ca, CA tap water safe to drink in 2023?
The 2023 Consumer Confidence Report for the City of Lathrop — Lathrop, Ca, CA water utility lists 2 contaminants at or above the federal limit: PFOS and Arsenic. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in City of Lathrop — Lathrop, Ca, CA tap water?
31 contaminants were measured in City of Lathrop — Lathrop, Ca, CA's 2023 Consumer Confidence Report, spanning metals, disinfection byproducts, and inorganic chemicals. 6 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in City of Lathrop — Lathrop, Ca, CA tap water?
2 contaminants in City of Lathrop — Lathrop, Ca, CA's 2023 report sit at or above the federal limit: PFOS (5.8× the limit); Arsenic (1.2× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in City of Lathrop — Lathrop, Ca, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2023 report is PFOS, at 5.8× the federal threshold. It belongs to the pfas ("forever chemicals") family of contaminants.
+Are any contaminants in City of Lathrop — Lathrop, Ca, CA tap water approaching the federal limit?
One contaminant is between 80% and 100% of the federal limit in this report: HAA5. 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 City of Lathrop — Lathrop, Ca, CA's 2023 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 City of Lathrop — Lathrop, Ca, 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 2023 report; a new report will replace it once the utility publishes its next annual update.