# Nevada Id - Lake Wildwood — Grass Valley, Ca, CA — Drinking Water Quality (2020)

> Contaminant levels for the Nevada Id - Lake Wildwood — Grass Valley, Ca, CA public water system from its 2020 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ca/nevada-id-lake-wildwood-grass-valley-ca/2020
- JSON API: https://www.thewatermap.com/api/water/ca/nevada-id-lake-wildwood-grass-valley-ca/2020
- Source: the utility's annual Consumer Confidence Report (CCR)
- Verification: transcribed by a model, cross-checked by a second model, approved before publishing
- Reporting year: 2020
- Contaminants measured: 14
- Contaminants with a federal limit: 1
- Contaminants at or above the federal limit: 0
- Part of The Water Map — https://www.thewatermap.com

## Contaminants measured

| Contaminant | Category | Measured level | Sampling context | Federal limit | Status |
|---|---|---|---|---|---|
| Chlorine | Disinfectants | 0.53–1.53 mg/L (Range) | North Auburn | No federal limit | Within the limit |
| HAA5 | Disinfection byproducts | 14–57 ug/L (Range) | Lake Wildwood | No federal limit | Approaching the limit |
| TTHM | Disinfection byproducts | 35–76.6 ug/L (Range) | North Auburn | No federal limit | Approaching the limit |
| Calcium | Metals | 4.4 mg/L (Reported level) | Elizabeth George | No federal limit | Detected — no federal limit |
| Copper | Metals | Not detected mg/L (90th percentile) | Lake of the Pines | 1.3 mg/L (Action level) | None detected |
| Lead | Metals | Not detected ug/L (90th percentile) | Lake of the Pines | No federal limit | None detected |
| Sodium | Metals | 15 mg/L (Reported level) | North Auburn | No federal limit | Detected — no federal limit |
| Cryptosporidium | Microbial | 0–0.093 (Range) | North Auburn | No federal limit | Detected — no federal limit |
| Total Coliform | Microbial | 2 (Reported level) | Loma Rica | No federal limit | Detected — no federal limit |
| Alkalinity | Physical & aggregate | 18–30 mg/L (Range) | Lake Wildwood | No federal limit | Detected — no federal limit |
| Hardness | Physical & aggregate | 16 mg/L (Reported level) | Lake of the Pines | No federal limit | Detected — no federal limit |
| pH | Physical & aggregate | 7.4–8.6 (Range) | Lake Wildwood | No federal limit | Detected — no federal limit |
| TOC | Physical & aggregate | 0.8–1.6 mg/L (Range) | North Auburn | No federal limit | Detected — no federal limit |
| Turbidity | Physical & aggregate | 100 (Reported level) | Elizabeth George | No federal limit | Detected — no federal limit |

## What these contaminants are

- **Chlorine** — A disinfectant added to drinking water to kill bacteria and viruses. Effective and necessary, but high residual levels can cause taste and odor issues; the EPA caps the residual disinfectant level.
- **HAA5** — Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. Long-term exposure above the federal limit is associated with an increased cancer risk.
- **TTHM** — Total trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
- **Calcium** — A naturally occurring mineral that contributes to water hardness. Not federally regulated for health; affects scaling and taste.
- **Copper** — A metal that enters water from corroding household plumbing. Short-term exposure causes stomach distress; long-term exposure can damage the liver and kidneys.
- **Lead** — A toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. There is no safe level of lead; it harms brain development in children and raises blood pressure in adults. The EPA sets an action level, not a health goal above zero.
- **Sodium** — A naturally occurring salt component. Not federally regulated for health; relevant for people on sodium-restricted diets.
- **Total Coliform** — A group of bacteria used as an indicator of overall water-system sanitation. Coliforms themselves are usually harmless, but their presence signals that disease-causing organisms could enter the system.
- **Alkalinity** — A measure of the water's capacity to neutralize acids. Not federally regulated for health; relevant to corrosion control and treatment.
- **Hardness** — A measure of dissolved calcium and magnesium minerals. Not federally regulated for health; affects scaling, soap use, and taste.
- **pH** — A measure of how acidic or basic the water is. Regulated only as a secondary standard; very low or high pH can corrode pipes or affect taste.
- **TOC** — Total organic carbon — a measure of organic material dissolved in the water. Not harmful itself, but it is the raw material that forms disinfection byproducts; removal is a treatment requirement.
- **Turbidity** — A measure of cloudiness from suspended particles in the water. High turbidity can shelter microbes from disinfection; the EPA enforces it through a treatment-technique standard.

## How to read this

- A water-quality report covers an entire service area, not a single address.
- 'Federal limit' is the EPA standard (MCL, action level, treatment technique, etc.) that the measured level is compared against.
- 'At or above the federal limit' means the utility's own reported figure met or exceeded that standard.

_Figures are the utility's own published numbers. Generated 2026-06-04 from thewatermap.com._