Drinking water quality · 2023
· Verified
What's in Terrace Water Company — Colton, Ca, CA tap water
42 contaminants were measured in the Terrace Water Company — Colton, 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
- 42
- Over federal limit
- 2
- Approaching the limit
- 0
- Worst contaminant
- PFOS
- Service area
- CA
3.3× the limit
state-level CCR
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. | 13.3 ng/LAverageTest Results | 6.5 ng/LNL | At or above the limit |
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | 6.2 ng/LAverageTest Results | 5.1 ng/LNL | At or above the limit |
| Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' | 3.9 ng/LAverageTest Results | 500 ng/LNL | Detected — no federal limit |
| Perfluoroheptanoic acidPerfluoroheptanoic acid, a PFAS 'forever chemical.' | 3.2AverageTest Results | None set | Detected — no federal limit |
| Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.' | 6.6AverageTest Results | 3NL | Detected — no federal limit |
| Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.' | 5 ng/LAverageTest Results | None set | Detected — no federal limit |
| Perfluoropentanoic acidPerfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.' | 6.6 ng/LAverageTest Results | None set | Detected — no federal limit |
| PFBAPerfluorobutanoic acid, a shorter-chain PFAS 'forever chemical.' | 5AverageTest Results | None set | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 4.35 mg/LAverageTest Results | 10 mg/LMCL | Within the limit |
+By source (2)— Test Results, City of Rialto
| |||
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.44 mg/LAverageTest Results | 4 mg/LMCL | Within the limit |
+By source (2)— Test Results, City of Rialto
| |||
| ChlorideA naturally occurring salt compound. | 14.85 mg/LAverageTest Results | None set | Detected — no federal limit |
+By source (2)— Test Results, City of Rialto
| |||
| SulfateA naturally occurring mineral from rock and soil. | 51.33 mg/LAverageTest Results | None set | Detected — no federal limit |
+By source (2)— Test Results, City of Rialto
| |||
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 1.12 mg/LAverageTest Results | 4 mg/LMCL | Within the limit |
+By source (2)— Test Results, City of Rialto
| |||
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 3.6 pCi/LAverageTest Results | 15 pCi/LMCL | Within the limit |
+By source (2)— Test Results, City of Rialto
| |||
| RadonA naturally occurring radioactive gas that can dissolve into groundwater. | 333.3 pCi/LAverageTest Results | None set | Detected — no federal limit |
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 2.4 pCi/LAverageTest Results | 20 pCi/LMCL | Detected — no federal limit |
+By source (2)— Test Results, City of Rialto
| |||
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | 130 ug/L90th percentileAt the tap | 1300 ug/LAction level | Within the limit |
| IronA naturally occurring metal common in groundwater. | Not detected ug/LMaximumTest Results | None set | None detected |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 0 ug/L90th percentileAt the tap | None set | Within the limit |
| BoronA naturally occurring element from rock and soil. | 78.33 ug/LAverageTest Results | None set | Detected — no federal limit |
| CalciumA naturally occurring mineral that contributes to water hardness. | 67 mg/LAverageTest Results | None set | Detected — no federal limit |
+By source (2)— Test Results, City of Rialto
| |||
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 1.2–1.37 ug/LReported levelCity of Rialto | None set | Detected — no federal limit |
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 9.6 mg/LAverageTest Results | None set | Detected — no federal limit |
+By source (2)— Test Results, City of Rialto
| |||
| ManganeseA naturally occurring metal from soil and rock. | 3.33 ug/LAverageTest Results | None set | Detected — no federal limit |
| PotassiumA naturally occurring mineral from rock and soil. | 3.03 mg/LAverageTest Results | None set | Detected — no federal limit |
+By source (2)— Test Results, City of Rialto
| |||
| SodiumA naturally occurring salt component. | 32.17 mg/LAverageTest Results | None set | Detected — no federal limit |
+By source (2)— Test Results, City of Rialto
| |||
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.06 NTUAverageTest Results | 1 NTUMCL | Within the limit |
| AlkalinityA measure of the water's capacity to neutralize acids. | 176.67 mg/LAverageTest Results | None set | Detected — no federal limit |
+By source (2)— Test Results, City of Rialto
| |||
| Bicarbonate | 220 mg/LAverageTest Results | None set | Detected — no federal limit |
+By source (2)— Test Results, City of Rialto
| |||
| HardnessA measure of dissolved calcium and magnesium minerals. | 206.67 mg/LAverageTest Results | None set | Detected — no federal limit |
+By source (2)— Test Results, City of Rialto
| |||
| OdorA measure of detectable smell in the water. | 1.01AverageTest Results | None set | Detected — no federal limit |
+By source (2)— Test Results, City of Rialto
| |||
| pHA measure of how acidic or basic the water is. | 7.39AverageTest Results | None set | Detected — no federal limit |
+By source (2)— City of Rialto, Test Results
| |||
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 530 uS/cmAverageTest Results | None set | Detected — no federal limit |
+By source (2)— Test Results, City of Rialto
| |||
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 338.33 mg/LAverageTest Results | None set | Detected — no federal limit |
+By source (2)— Test Results, City of Rialto
| |||
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Nitrate Nitrite | 0.54 mg/LAverageTest Results | 10 mg/LMCL | Within the limit |
| Cis Dichloroethylene 12 | Not detected ug/LAverageTest Results | None set | None detected |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 2.85 ug/LAverageTest Results | None set | Within the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | Not detectedReported levelLevel of Detections | None set | None detected |
| PerchlorateA chemical used in rocket fuel and fireworks that can also form during disinfection. | 1.37 ug/LAverageTest Results | None set | Detected — no federal limit |
+By source (2)— City of Rialto, Test Results
| |||
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0Highest single sampleNo. of Detections | None set | None detected |
+By source (2)— No. of Detections, Total No. of Detections
| |||
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| 1,2,3-TCP | Not detected ug/LMaximumTest Results | None set | None detected |
| TetrachloroethyleneAn industrial solvent (PCE) used in dry cleaning and degreasing. | Not detected ug/LMaximumTest Results | 5 ug/LMCL | None detected |
Source: Terrace Water Company — Colton, Ca, CA's 2023 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 Terrace Water Company — Colton, Ca, CA's water
+Is Terrace Water Company — Colton, Ca, CA tap water safe to drink in 2023?
The 2023 Consumer Confidence Report for the Terrace Water Company — Colton, Ca, CA water utility lists 2 contaminants at or above the federal limit: PFOS and PFOA. 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 Terrace Water Company — Colton, Ca, CA tap water?
42 contaminants were measured in Terrace Water Company — Colton, Ca, CA's 2023 Consumer Confidence Report, spanning metals, pfas ("forever chemicals"), and physical & aggregate. 13 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 Terrace Water Company — Colton, Ca, CA tap water?
2 contaminants in Terrace Water Company — Colton, Ca, CA's 2023 report sit at or above the federal limit: PFOS (3.3× the limit); PFOA (1.6× 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 Terrace Water Company — Colton, Ca, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2023 report is PFOS, at 3.3× the federal threshold. It belongs to the pfas ("forever chemicals") family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Terrace Water Company — Colton, 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 Terrace Water Company — Colton, 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.
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